11.30.2007

The week's most viewed stories

The most popular stories on Earth-Touch in the past week (from Friday 23 November to Thursday 29 November 2007) were:

Number 1

Baboon feed on fruit

While the troop of baboons looks for food in the forest, a youngster performs contortionist feats in a tree.




Number 2

Surrounded by sharks


The scars and wounds of the bolder individuals are clearly visible in the crystal-clear water.




Number 3

Lions ready to mate in spectacular afternoon light

As storm clouds gather, lionesses move across a flood plain in the Okavango Delta with lions in tow, awaiting the opportunity to mate as soon as the females come into oestrus.



All images © Earth-Touch 2007

Did you know? Hippopotamus

The name hippopotamus comes from the Greek word hippopotamos, which means water or river horse. This refers to the herbivore’s habitat.

When exposed to harsh sunlight, hippos secrete a reddish-pink substance from their subdermal glands. This ‘blood sweat’ protects the skin from the sun and inhibits dehydration.

The secretion absorbs sunlight and so acts as a sunscreen. It may also protect the hippo from bacteria as wounds inflicted to the skin heal relatively quickly.

Although often found in water, hippos cannot swim. They lack aquatic adaptations such as a streamlined body or webbed feet. But they have a natural buoyancy that allows them to push themselves up and down in the water.

They can stay under water for up to five minutes and walk on the bottom of the river or lake, preferring shallow water near sand banks.

Watch the hippos in the Okavango Delta in the Earth-Touch clip,
Dramatic change in the delta.

Image © Earth-Touch 2007

Did you know? Roaches are not that bad

Everyone loves to hate cockroaches – they are usually considered filthy and are known to cause asthma in children.

But these insects contribute to the earth’s biodiversity; and as omnivores they clean the environment and help in recycling organic litter that would otherwise accumulate.

In a bat cave, for example, they scavenge on bat guano: see the
Earth-Touch video clip filmed in Thailand, Predators and prey share bat cave.

In turn, cockroaches are food for small mammals, birds, amphibians and lizards.

Of all the species of cockroach (over 3000), only 10 are on the World Health Organisation list of pests.

Image courtesy stock.xchng

11.29.2007

Captured gorillas to return home tomorrow

A group of four western lowland gorillas (Gorilla gorilla gorilla) which made international headlines in 2002 when they were smuggled into the Taiping Zoo in Malaysia will return home to Cameroon tomorrow.

On discovery of the illegal shipment, the Malaysian government, through its Convention on International Trade in Endangered Species of Wild Fauna and Flora (Cites) management authority, confiscated the animals and transferred them to the Pretoria Zoo, South Africa, where they have been housed for safekeeping since 2004.

“Although it is not known how and where the infant gorillas where first captured, DNA testing has revealed that Cameroon was their most likely origin,” Pretoria Zoo marketing manager Craig Allenby told Earth-Touch.

The International Fund for Animal Welfare (IFAW) is sponsoring the return of the gorillas. Air transportation is being provided and funded by Kenya Airways.

According to a joint press release issued by the South African Department of Science and Technology, IFAW and the National Zoological Gardens of SA, the primates – a male and three females – were more than likely victims of the bushmeat trade. Typically, adult gorillas are killed for meat and their young are snatched for sale. At least four out of five infants die before they reach adequate care, says the department.

“We’re delighted that a final decision has been reached and we will be working closely with the National Zoological Gardens of South Africa to ensure the safe return of the Taiping Four to Cameroon,” says Christina Pretorius of IFAW, in the press statement.

The gorillas will be relocated to the Limbe Wildlife Sanctuary in Cameroon at the start of the dry season there, allowing the primates to acclimatise to their new home. “It’s important that the animals are moved from one dry area (Pretoria) to another to prevent infection or illness,” says Allenby.

“Limbe Wildlife Centre has been identified as an appropriate centre of excellence to care for the animals,” says IFAW. “Run in conjunction with the Cameroonian government, Limbe has an impeccable record in gorilla husbandry, and is currently caring for 11 gorillas.”

“A former zoo, the centre is now geared towards the rehabilitation of primates, with the long-term aim of returning the animals to a secure wild environment. All animals at the sanctuary are on contraception, so it is not a breeding facility,” says Pretorius.

“The Taiping Four will be integrated into the resident gorilla population at Limbe once the animals have completed a quarantine period of a few months,” she adds.

The shy, vegetarian western lowland gorillas are native to the tropical forests of Cameroon, the Central African Republic, the Republic of Congo, Equatorial Guinea, Gabon, and Nigeria.

Until several decades ago, primates enjoyed the seclusion of vast tracts of forest but today Africa’s growing population is putting pressure on various species. Deforestation and the bushmeat trade are particular threats.

Though protection laws exist in most countries still inhabited by gorillas, enforcement is often lacking. Civil wars in Rwanda and the Democratic Republic of Congo have had an impact on conservation efforts and opened parks to poachers.

Outbreaks of ebola, a hemorrhagic virus which affects humans as well as gorillas, and increased hunting led the World Conservation Union (IUCN) to move the western lowland gorilla, the world’s largest primate, from endangered to critically endangered status this year. IFAW estimates that there are 94 000 western lowland gorillas left in the wild.

Photograph: One of the western lowland gorillas, part of the Taiping Four group, which will be returned to Cameroon tomorrow. Image courtesy IFAW/Trevor Samson © Earth-Touch 2007

Did you know? Pit vipers

Pit vipers, as their name suggests, have a heat-sensitive pit on either side of their head. These pits are extremely sensitive to changes in temperature, being covered with a temperature sensitive membrane.

These organs can help the pit viper sense the presence of warm-blooded animals, which is ultimately useful at night when these reptiles most often hunt for small animals such as frogs and lizards. They often form ‘S’-shapes with their body, enabling them to strike at any time.

See the white-lipped green pit viper (Trimeresurus albolabris) in Thung Salaeng Luang National Park, Thailand in the Earth-Touch clip, Pit viper in the bushes.

Image © Earth-Touch 2007

Marabou storks’ sunset viewing

The marabou stork (Leptoptilos crumeniferus) is a large and heavy bird, with a bald head, long legs and a massive bill. Its odd shape is silhouetted against the evening sky of the Okavango Delta, Botswana in the Earth-Touch clip, Storks watch giraffe go by.

These unmistakable birds sit perched on a dead leadwood tree, watching a group of giraffes grazing in the sunset.

As they turn their heads to watch the tall mammals, the light of the sun shines through the storks’ nostrils.

Marabou storks are scavengers often seen near game kills or feeding at refuse dumps.

Image © Earth-Touch 2007

11.28.2007

Earth-Touch team in southern Mozambique

The underwater Earth-Touch team has moved north up the Southern African coastline in the warm Indian Ocean waters, from filming off the coast of the South African province of KwaZulu-Natal, to the waters of Southern Mozambique.

The Mozambican coastline is famous for its reef diving sites such as Ponta Mamoli and Ponta Malongane, frequented by dolphins, sharks, turtles, rays, bass and thousands of other species. The reefs at these sites are also typically home to a wealth of colourful, soft corals.

See some of this life in the Earth-Touch footage, Up close with bottlenose dolphins, Surrounded by sharks and Myriad of life on Mozambique reef.

Image: Blacktip shark in Southern Mozambique © Earth-Touch 2007

Did you know? Lion manes

The male lion is distinguished from the female by the mass of hair surrounding his head, commonly known as a mane.

The mane’s size and colour changes with age, making the more adult male look bigger and more threatening. This may foil attempts by younger males to confront the more domineering looking male.

The mane also serves as a form of protection for the head and neck during fights with other males. The long, thick hair could help to prevent severe injury around the crucial neck area from the sharp claws of another lion.

See the beautiful, thick manes of a two male lions blowing in the wind in the Earth-Touch story, Lions ready to mate in spectacular afternoon light.

Image © Earth-Touch 2007

11.27.2007

Unusual elephant noise

Waking up to the distinctive trill of the woodland kingfishers and the cacophony of sound created by the morning calls of the coucals, doves, warblers and other Okavango Delta birds is one of the more pleasurable experiences in life. These rich, evocative sounds are matched only by the evening orchestra of these same species as they prepare to retire for the night.

Earth-Touch users can share this pleasure by listening to an array of wildlife sounds from the Earth-Touch footage.

If one listens closely, on this particular morning, in addition to the usual array of birdcalls one can also hear a leopard coughing, a lechwe snorting (Kobus leche, a species of antelope) and the cracking and splintering of an elephant bull pushing down a tree.

This particular elephant is well known to the inhabitants of the Earth-Touch camp in the Delta. It is distinctive in that it makes an unusual noise – also captured on the audio clip – that sounds more like a didgeridoo than the conventional rumbling and purring of an elephant. It is not a sound often made by elephants.

We have heard other elephants making this noise before, but this sound seems to be reserved as an occasional means of communication. This bull seems to use it a lot, as his primary form of audible (to us anyway) communication.

It is an intriguing sound and I wonder what he is trying to communicate and to whom.

– By Andy Crawford, Earth-Touch crew

Image © Earth-Touch 2007

Baboon acrobatics

You can’t help smiling when watching a troop of chacma baboons (Papio ursinus) – they look so human as they groom each other and play.

And in turn, the youngster in the Earth-Touch clip Baboons feed on fruit, filmed in the Okavango Delta in Botswana, got engrossed in watching the film crew from various angles.

Meanwhile, his troop found plenty of mangosteen fruit to eat.

Image © Earth-Touch 2007

Did You Know? Tokay geckos

The best way to track down the nocturnal tokay gecko (Gekko gecko) is to listen out for its loud, distinctive “to-kay” call after sunset.

Native to parts of Asia and the Indo-Australian Archipelago, this species also makes a variety of other calls which sound like “gah”, “eck” and, sometimes, a small dog’s bark.


One of the largest gecko species, tokays are sturdy, colourful creatures with soft, granular skin which feels velvety to the touch. The skin is typically grey with several brownish-red to bright red spots. These geckos have the ability to lighten or darken their skin colour to blend in with their surroundings.


Known for their aggressive behaviour when cornered, they display their red tongues and black throats in a fierce gape, and can inflict a painful bite.

This species can reach up to 40cm (15.7in) and weigh between 150g and 300g (5.2oz and 10.5oz). They feed on a range of insects, including cockroaches and crickets, as well as smaller geckos and vertebrates.


Although mainly found in tropical rain forests on cliffs and trees, this species’ habitat is vast. It’s not uncommon to see tokay geckos in houses and gardens throughout Thailand. They are also found in northeastern India and Bangladesh, through southern China and southeast Asia to Indonesia. Their use in Chinese medicine has caused declines in China, Vietnam and Thailand.

Tokays climb with great ease and have an excellent grip. Theoretically, hanging upside-down, these animals can support a 40kg (88lb) load. The secret to this lies in their feet, which are covered in hairs less than a tenth of the thickness of a human hair. Each one of these bears about a thousand smaller, mushroom-shaped fibres called spatulae. The spatulae get so close to the surface on which the animal is positioned that molecules in both the foot and the surface generate a tiny charge that briefly draws one to the other.

A canny defence mechanism of these geckos is their ability to cast off their tails and regenerate new ones. The cast-off tail often thrashes about for several minutes to distract whatever is threatening the gecko. This gives the tokay a gap to escape to safety. It takes about three weeks for these geckos to completely regenerate new tails, which are never as long as the original.

Tokays are solitary creatures, with males and females coming together only during the breeding season. Females lay two eggs at a time and are selective about finding the right site to deposit them. Once a solid foundation has been found, the hard-shelled, oval-shaped eggs are “glued” on to it. Both parents guard the eggs until they hatch. Young take up to 200 days to hatch. They are instantly aggressive and ready to bite.

See tokays in a cave in Thailand in the
Earth-Touch clip Life in a limestone cave.

Image © Earth-Touch 2007

11.26.2007

Interact with elephants in the new Earth-Touch multimedia widget

Earth-Touch has developed a series of multimedia ‘widgets’ – interactive content packages on a range of topics such as elephants and the Indian Ocean.

Each widget is filled with educational information, presented in a fun way using text, animation, video and high-quality images from
our field footage, for both kids and adults to enjoy.

Our latest widget offering is all about elephants.

Did you know that elephants can communicate over distances greater than a kilometre (0.6mi) through infrasound, which is pitched too low for humans to hear? Or that elephant cows are pregnant for 22 months before giving birth, and that their calves are raised in mostly female herds? Or that the trunk is a tool for both breathing and smelling?

Learn this and more in our interactive, multimedia elephant widget. Then take the widget quiz to see how much of an elephant expert you are!

Image © Earth-Touch 2007

Did You Know? How bats hunt at night

Wrinkle-lipped bats (Chaerephon plicata) are found in caves from sea level to about 200m (656ft) and require forested habitats. These bats have been listed as low risk on the IUCN Red List of threatened species in 2007.

How do these bats move around in the dark and hunt, as you can see in the Earth-Touch video clip Thousand of bats hunt at dusk, filmed in Thung Salaeng Luang National Park, Thailand?

Bats have a special sonar system called echolocation. They send out high-frequency calls from their mouths or noses and then listen for echoes that bounce off whatever objects are around them.

They are able to form images in their heads by listening to the echoes, just as humans form images by interpreting reflected light.

As a result, bats can comfortably move around in the dark and still manage to avoid predators, fly around objects and obstacles, locate food and capture insects.

View Predators and prey share bat cave for more on bats.

Image © Earth-Touch 2007

Spur-winged geese gather

As the environmental conditions in Botswana’s Okavango Delta continually change, there is always something new to see.

When the flood water recedes and dries up, flocks of spur-winged geese (Plectropterus gambensis) concentrate in the remaining pools before moving north into more permanent swamp areas. They will disperse again when the floods arrive.

Watch the Earth-Touch clip, Dramatic change in the delta.

Image © Earth-Touch 2007

11.23.2007

The week's most viewed stories

The most popular stories on Earth-Touch in the past week (from Friday 16 November to Thursday 22 November 2007) were:

Number 1

Pit viper in the bushes

The presence of frogs in the damp grass suggested that there might be snakes in the vicinity, and sure enough a young pit viper was soon spotted.



Number 2

Dramatic change in the delta

As the water retreats, animals and birds become concentrated in smaller and smaller areas until eventually they must leave and head north for the permanent swamps.




Number 3

Encounter with a big fish

A whale shark – the world’s biggest fish – trawls through the water, filtering nutrients out of the tons of seawater that flow continually through its mouth and gills.




All images © Earth-Touch 2007

Did You Know? Indian humpback dolphins

The Indian humpback dolphin (Sousa plumbea) can be spotted in waters along the eastern coast of South Africa and northern Mozambique in small schools of up to 25 animals.

But this species’ distribution is vast: it stretches from Africa’s eastern coastline to the Red Sea, Arabian Sea and Persian Gulf, and the animals have also been known to stray into the Ganges River in India and the Mediterranean via the Suez Canal.

Like bottlenose dolphins (Tursiops truncatus), humpback dolphins have long, slender beaks and broad-based dorsal fins that slope backwards. Humpbacks are medium in size and have slightly depressed melons (foreheads). Their wide flippers are rounded at the tips and their flukes are broad and full. Adults reach 2.8m (9ft) and can weigh up to 200kg (440lb).

Although Indian humpback dolphins are slow-swimming and avoid boats if possible, they readily associate with other species, especially bottlenose dolphins.

The two species, which were recently spotted socialising off South Africa’s northern KwaZulu-Natal coast (watch the
Earth-Touch clip, Dolphins meet and greet), are easy to tell apart: bottlenose dolphins have distinctly sickle-shaped fins (see image above) and humpbacks have a lobe in front of their dorsal fins.

Preferring shallow waters near the shore, Indian humpback dolphins often enter estuaries and mangrove swamps or the open sea in the vicinity of coasts and islands.


They feed on oil sardines, mackerel, mullet and other near-shore fishes. Off Southern Africa the species seems to feed on or close to reefs along rocky coastal areas in preference to areas with sandy bottoms.


Image © Earth-Touch 2007

Did you know? African wild dog

African wild dogs are highly endangered carnivorous animals which hunt in packs. The average size of a pack is about 10, but this can reach 30 dogs or more in rare incidences. The role of the adult wild dogs is to care for the pups and provide food.

A lesser member of the pack leads a hunt; once the prey is determined by the pack itself the prey is captured and killed by the hunt leader.

Before a hunt a ceremonial greeting takes place in which the dogs sniff, muzzle-lick, chirp and chatter to each other.

Wild dogs regurgitate food in order to feed other pack members, mainly small pups that are confined to dens and their minders.

The youngest members of the pack are the first to eat, followed by the subordinates. The dominant adults can eat at any time.

Their preferred prey is small antelope such as impala, kudu and reedbuck.

See up-close footage of African wild dogs in the Earth-Touch clip, Wild dogs sleep off their meal.


Image © Earth-Touch 2007

11.22.2007

Newborn giraffe follows mother

The Earth-Touch film crew in the Okavango Delta, Botswana, came across a group of giraffes inspecting a recently born calf, its fur still matted.

Its mother then led the calf away. In the video clip, Giraffe mother leads newborn calf away from herd, you can watch the unsteady youngster struggling to make his way through the long grass on the flood plain.

Image © Earth-Touch 2007

Did You Know? Barn swallow

Five million barn swallows (Hirundo rustica) migrate from Europe to the Mt Moreland reed bed on the KwaZulu-Natal coast of South Africa in the Southern Hemisphere’s summer months of October and November each year, returning in the autumn.

They are not the only ones coming in to land here, though: adjacent to the roosting site is the expanding La Mercy airport. The airport is small now, with no dusk flights, but that will change in preparation for 2010, when South Africa is hosting the FIFA World Cup.

A campaign to protect the birds has been led by BirdLife South Africa and the importance of the site has been acknowledged by the Airports Company South Africa (Acsa).

Acsa is to employ environmental management staff to manage the reed bed and will install radar technology in the airport control tower so that planes can avoid large flocks of swallows. This reed bed population represents over 1% of the estimated global population of 190 million individuals, says BirdLife.

According to Roberts Birds of Southern Africa VIIth edition, an estimated 22-44 million birds from Western Europe and 44-88 million from Eastern Europe and Asia migrate southwards into Africa every year. The longest distance recorded between a South African ringing (in Mossel Bay, Western Cape) and recovery (in Petrovsk, Russian Federation) was 11 358km (7 057mi).

Two birds ringed in South Africa were found 34 days later on the eastern shore of the Black Sea in Georgia. The oldest ringed bird that has been found was 17 years of age. Roberts also states that some roosting sites have been used for more than 50 years.

Barn swallows are up to 20cm (8in) in length and weigh up to 18g (0.63oz). They have a long, forked tail, iridescent blue upper parts and reddish underparts. According to the Cornell Lab of Ornithology, females prefer to mate with males that have the longest and most symmetrical tails. The birds catch insects in flight. Their nests are open cups of mud and grass and they lay three to seven eggs.

Watch the swallows gather to roost in the reed bed in the Earth-Touch video clip, Swallows rain down into reed bed.

Image of barn swallows in flight © Earth-Touch 2007; close-up of barn swallow courtesy Engineer111/Wikipedia (source).

Did You Know? Haemanthus

Haemanthus is a genus of the flowering plant family Amaryllidaceae, which is endemic to Southern Africa.

Haemanthus coccineus
, commonly known as the “paintbrush” or “powderpuff” lily, has a striking head of bright orange needles.

This plant was one of the first Haemanthus species to be introduced to European horticulture and was described by Carl Linnaeus, the father of modern taxonomy, in 1762.

View these beautiful flowers, which produce abundant nectar and pollen, in the Earth-Touch story, Monkeys play in dune forest wonderland.

Image © Earth-Touch 2007

11.21.2007

Hyenas tag along with leopard

In the Earth-Touch clip, Hyenas dog leopard, two hyenas are on high alert, waiting to scavenge something from a nearby predator.

After some searching through the sage of the Okavango Delta, Botswana, the film crew spotted a female leopard swiftly and silently moving through the bush.

Perhaps she had been hunting earlier but being followed by the hyenas had contributed to her failure.

Leopards are the largest of the spotted cats, a male weighing about 60kg (132lb) and a female 30kg (66lb).

Image © Earth-Touch 2007

Did you know? Difference between dolphins and porpoises

Dolphins and porpoises are cetaceans. One of the differences between them is in their teeth.

Most species of dolphin have cone-shaped teeth and a prominent beak. In contrast, all six species of porpoise have blunt heads and teeth with rounded sides that bulge like the blade of an old-fashioned digging spade.

You can view the following Earth-Touch footage of dolphins:

Turtles and dolphins in reef dive and Dolphin encounter.

Image © Earth-Touch 2007

11.20.2007

Buffalo chase off lions

Despite the bigs cats being dubbed “king of the jungle”, the heavy mass of a herd of buffalo is too much for a pride of lions as they are chased by buffalo in the Earth-Touch clip, Lions foiled by buffalo herd.

In this footage the buffalo are seen grazing on a riverbed of the Okavango Delta in Botswana. The lions had anticipated this and were waiting for the buffalo when they arrived to forage.

When a lioness tried to pounce, a chase between the lions and the buffalo ensued, with the buffalo winning the day in a scene reminiscent of the clip made famous on YouTube, Battle at Kruger.

Image © Earth-Touch 2007

Devil firefish in the Indian Ocean


Devil firefish are sea fishes which prey on crabs. See them swim and sleep in the Indian Ocean in the Earth-Touch clips, Embattled reef dwellers ride out the storm and Sleeping devil firefish.

This fish, Pterois miles, also known as the common lionfish, is found in crevices, shipwrecks and rocky or coral reefs.

It protects itself with its venomous dorsal spine. Threatening a devil firefish could result in a painful or even mortal wound.

Devil firefish are found in the Indian Ocean, the Red Sea and the Mediterranean.

Image © Earth-Touch 2007

11.19.2007

November 2007 newsletter


View the Earth-Touch November newsletter by clicking here: November 2007 Earth-Touch Newsletter



Excerpt from November 2007 Earth-Touch newsletter:

Most-viewed stories in October
Earth-Touch users were drawn in particular to our whale coverage in October. We had wonderful close-up views of the southern right whales that visit South Africa’s Western Cape shore (Close encounter with a leviathan).

The story Swimming amongst seals puts users in the midst of these agile animals underwater, while in Life teems in the kelp forest, marvellous colours and shapes are revealed by the camera lights. The waterhole Earth-Touch has been filming in the Kalahari Desert in Botswana has attracted attention too: the spring rain meant not as many animals as before went down to drink, but the African bush put on its own show (Rain arrives at last).



We’d love to hear from you what you'd like us to include in future newsletters, and whether you think they’re a useful form of communication from us – or how we could do them better.

Please post your comments on this blog, or email us at: blogs@earth-touch.com

Please email us, too, if you’d like to subscribe to our monthly newsletter and we’ll happily add you to our list.

‘Escaped primate’ probably a large squirrel

The media across the United States of America has been abuzz with talk of a large, orange-coloured primate, possibly an orang-utan, loose in Florida’s Baker County. Several people have seen it. The local Florida Times-Union newspaper, for example, reported:

An orang-utan sighting has Baker County residents going ape and now Fish and Wildlife officials are hoping to lure the animal out the trees using a secret weapon: doughnuts.

Although the Florida Department of Fish and Wildlife can’t confirm it was an ape, some people reported seeing a “big orange ball of fur,” said Karen Parker, Fish and Wildlife spokeswoman.

Some think it’s just a spider monkey or a squirrel. Others are seriously investigating whether it was a “baby Bigfoot.”But at the weekend, several online sites and agencies such as the Associated Press ran stories saying this was highly unlikely, and that the animal was far more likely to be a large fox squirrel, (Sciurus niger), the largest species of tree squirrels native to North America, according to local wildlife experts.

Ken Holmes of the Florida Fish and Wildlife Conservation Commission told The Florida Times-Union he thought the animal was probably an orange-phase fox squirrel.

“I’ll be astonished if it’s an orang-utan,” Holmes said. “I can quite confidently say it’s probably not an orang-utan.”

The fox squirrel’s natural range extends through most the eastern United States, but the species has also been introduced to other parts of the country, including western states such as California and Washington.

Large fox squirrels can grow to about 70cm (28in), and have tails longer than 30cm (12in).

Fox squirrel image courtesy Jason Quinn and Kaori Otsuki/Wikipedia (source); orang-utan image courtesy Miraceti/Wikipedia (source).

Did you know? Hyena

As hyenas are scavengers there is often intense competition at kill sites to get enough food as fast as possible. That is why a lot of what is consumed at kills is hair, bones and teeth.

The hyena’s digestive fluids are adapted to enable them to digest bones and teeth, but hair cannot be digested.

The animals therefore regularly get rid of the hair they eat by coughing it up. The remains of this are often found around dens and hyena paths. With older hyenas this hair can sometimes be found in the animal’s droppings. Inspection of this residue often gives clues as to what was recently consumed by the animal.

See these animals on the move in the Okavango Delta, Botswana, in the Earth-Touch clip, Hyenas dog leopard.

Image © Earth-Touch 2007

11.16.2007

The week's most viewed stories

The most popular stories on Earth-Touch in the past week (from Friday 09 November to Thursday 15 November 2007) were:

Number 1

Predators and prey share bat cave

It’s the circle of life: cockroaches feed on bat guano, spiders feed on cockroaches and snakes feed on bats.





Number 2

Wild dogs rest and play

Replete with their recently taken impala meal, a pack of African wild dogs rests up in the sage.





Number 3

Hyenas dog leopard

A couple of hyenas tag along behind a leopard, their presence diminishing her chances of success in making a kill.





All images © Earth-Touch 2007

Massive whale shark spotted

In the Earth-Touch clip, Encounter with a big fish, a large whale shark, measuring about 12m (39ft) is seen swimming near Leven Point, on the north coast of Kwa-Zulu Natal province between Kosi Bay in the north and Richards Bay in the south, South Africa.

The whale shark (Rhincodon typus), is the largest fish in the world.

Despite their massive size they are rarely seen due to their protective colouring. Their backs are covered in white, ornate spots. This provides excellent camouflage, especially when viewed from the surface.

This whale shark moves swiftly through the waters, filtering out nutrients as it travels. Whale sharks eat mostly plankton and micro-organisms, and are harmless to humans.

Little is known about these huge fish, which occur in the Indian, Atlantic and Pacific oceans.

Image © Earth-Touch 2007

11.15.2007

Did you know? Ghost crabs


In winter the Tembe-Thonga people of Mozambique find little to eat on the beaches except for the local three species of ghost crab, so named because they appear and disappear from sight in a ghostly manner.

All three crabs have box-shaped carapaces, bloated nippers and eyes on stalks. The pink ghost crab (Ocypode ryderi) is pale pink and has purple markings on its leg joints. The horn-eyed ghost crab (Ocypode ceratopthalmus) is grey and has distinct horns covering its eyes. Ocypode madagascariensis is similar to the pink ghost crab but has no purple leg joints.

The crabs appear in great numbers: around 15 000 per kilometre (0.6 mi) of sandy shore. They dash up and down the beach to find washed-up fish, mussels or even a decomposing whale to feed on.

At high tide and when in danger, ghost crabs hide in their burrows, which protect them from predators such as palm-nut vultures (Gypohierax angolensis).


That
s not enough protection from humans, though. The Tembe-Thonga hunt ghost crabs, which they call inkalankala. According to Thomas P Peschak in his book Currents of Contrast: life in southern Africa’s two oceans, most of the hunting is done by women and on a typical trip they may walk up to 6km (3.7mi) along the beach and collect about 30 crabs each.

There are two ways of catching crabs. One of them is to bend down and start digging ferociously until a crab is caught and restrained. The second way is even more energetic and practised by young women. They charge onto the beach in groups and catch the crabs using their hands and feet.

Catch a glimpse of these crustaceans in Ghostly crabs dance along beach.

Image © Earth-Touch 2007

A diver’s best friend


The potato bass (Epinephelus tukula) is one of the largest members of the rockcod family, reaching 2m (6.5ft) in length. It’s easily identified by the large, brown spots on its body.

It is an inquisitive species. At Bass City, a reef in the waters of southern Mozambique, an individual potato bass nicknamed Bert is well known for swimming with divers.

These fish can be aggressive to intruders, however.

To see them in action, watch these Earth-Touch video clips:

Plankton soup
Bass shelter
Predators lurk in underwater caves
Hook, line and sinker

Images © Earth-Touch 2007

Did you know? Buffalo horns

Male buffaloes use their horns to challenge rival bulls, mainly when fighting for a mate or defending mating opportunities. Pure defence is a less important function of the horns.

The horns of the males are heavier and more curved than those of the females. In cows, the junction between the horns is often covered with hair, rather than being exposed as seen with the bull. These horns are rigid and coarse and then become smooth at the tip, with a span of up to 1m (3ft 3in).

See these horned ruminants in the Earth-Touch clips, Buffalos graze in sunsetBuffalo take shelter from the cold, Buffalo herd on the alert and Lions foiled by buffalo herd

Image © Earth-Touch 2007

11.14.2007

Giraffe at sunset

As the sun paints the sky different shades of red and orange in the Okavango Delta, Botswana, passing giraffe are silhouetted against the setting sun in the Earth-Touch clip, Storks watch giraffe go by.

The sunset in this part of the world is often spectacular, especially during the summer months. As Botswana is a flat country, much of it desert, there are layers of dust that fill the air, enhancing the golden haze on the horizon.

Giraffe use this period to slowly move across the land, feeding as they go. Marabou storks, their bodies outlined with glowing light, watch them quietly moving along their way.

Image © Earth-Touch 2007

Did you know? African penguins

The African penguin (Spheniscus demersus) is the only species of penguin found in Africa. These aquatic birds are now vulnerable to extinction, with about 56000 breeding pairs left in the world. It is believed that there were 1.5-million penguins on Dassen Island alone (about halfway between Table Bay and Saldanha Bay, on the west coast of South Africa) at the beginning of the 20th Century.

Penguins are known to adapt to very cold climates, but the African penguin is adapted to survive in the temperate climate of Africa. To cope with the heat, African penguins are active at breeding sites during the cooler hours of early morning and evening and spend much of the day in the sea.

These monogamous birds feed on a variety of small fish, from anchovies to sardines. When hunting, African penguins can put on bursts of speed of around 15-19km/h(9.3-11.8mph).

See these birds waddling on the beaches and rocks and swimming in the seas of False Bay, Western Cape, South Africa in the Earth-Touch clips, Penguin launch, Penguins dive into stormy sea and Penguins line up at sunrise.


Image © Earth-Touch 2007

Elephants and other wildlife return to southern Sudan

The Associated Press has filed a report picked up by many of the world’s newspapers that thousands of animals are returning to the southern Sudan, two years after the country’s 22-year north-south civil war ended.

This conflict, which is not to be confused with the ongoing humanitarian crisis in Darfur in western Sudan, killed about 2-million people and drove away huge numbers of animals.

Now, Sudan wildlife services estimate 7000 elephants have returned, along with about 1500 giraffes and about 500 oryx antelopes; the latter two had been presumed regionally extinct.

Lions, leopards and a wide variety of gazelles, some unique to Sudan, are also being seen again. AP quotes Lt Col Charles Joseph, deputy warden of south Sudan’s Nimule National Park, as saying of the elephants’ return: “To anyone who thought they’d disappeared forever, it’s like magic.”

AP cites a US-based Wildlife Conservation Society survey in February this year which estimated herds of antelope and gazelle in the southern Sudan numbered 1.3-million. “It could well be the largest mammal migration on Earth,” said Paul Elkan, the society’s south Sudan country director.

In May, Reuters reported that hundreds of elephants had been spotted on an island in the swamps in south Sudan.

Reuters followed this up with an October 2007 report in which it said Sudan would soon be opening its first tourist lodge in the elephant-rich Nimule area, which borders Uganda.

Map of Sudan courtesy Vardion/Wikipedia

Cape vultures in the Drakensberg

In the Earth-Touch clip, Vultures ride the thermals, the Cape vulture (Gyps coprotheres) is seen around the rugged cliffs of the northern Drakensberg in South Africa.

In this footage the birds, also called Cape griffon, are shown flying high in the African skies, searching for food in the form of carrion. They glide on thermals with extended wings, which can span up to 2.55m (8.4ft).

Other members of the colony sit in the nesting area of the cliffs, preening.

The chicks whistle and chirp, while the adults make a dramatic ‘craak’ sound.

This colony is one of the largest on the African continent, consisting of about 400 adult breeding pairs.

Image © Earth-Touch 2007

11.13.2007

Bottlenose dolphins up close in Mozambique

In the Earth-Touch clip, Dolphin encounter, a pod of about 50 bottlenose dolphins (Tursiops truncates) is captured. The crew is able to get close to the animals and swim alongside them.

This pod was found just off Techobanini Bay in the Indian Ocean waters of southern Mozambique. After several attempts to get close and arc the boat in their direction the crew was able to get into the water with them.

After a short period of inspection from the pod the Earth-Touch team was accepted and finally able to film these intelligent creatures.

Dolphins are thought to be highly intelligent, on the evidence of their large brains (half the size of a human brain) and complex social structure and behaviour. Dolphins have been seen actively caring for one another and learning from experiences.

The bottlenose dolphin is the largest of the beaked dolphins and is commonly found in coastal waters as well as offshore.

Image © Earth-Touch 2007

Did you know? Lion prides

Lions are the only social cat species, living, hunting and feeding in prides. Prides can consist of up to 12 females with their cubs and up to six adult males.

The main reason for this is food acquisition. Lions hunt together, each lion taking on a specific role. Territorial issues and the protection of cubs are also key reasons why lions socialise.

Lionesses tend to remain in the group they were born into; therefore prides are generally made up of related lions.

Male lions fiercely compete for leadership roles in the pride. A male lion will remain the head of the pride for about three years.

It is however not essential for lions to be part of a pride. They are able to sustain themselves individually, as one sees with nomadic lions.

See a pride on the lookout for food in the Earth-Touch clip, Lions foiled by buffalo herd.

Image © Earth-Touch 2007

11.12.2007

Lessons in healing from sea cucumbers


Some species of animals can replace entire organs when they are damaged, but it has not been clear how similar this process of regeneration is to the process of wound healing.

Studying the sea cucumber Holothuria glaberrima, a species known for its regenerative powers, researchers at the University of Puerto Rico have now found that the cellular mechanisms in both processes are analogous.

This suggests that an inability to regenerate organs may be due to the absence of repair mechanisms or the inability to activate the repair process.

ScienceDaily reports Professor José García-Arrarás as saying: Many people regard sea cucumbers and other echinoderms like star fish and brittle stars as bizarre, exceptional outcasts because of their regenerative abilities. But we’ve shown that they use the same ‘ordinary’ mechanisms and processes to both regenerate and heal wounds.”

He added: “Sea cucumbers will probably provide us with the key to deciphering how to regenerate our tissues, or at least find out what is needed to do this.”

The research is published in the open access journal BMC Developmental Biology.

Image: Holothuria glaberrima. Courtesy: Pablo Andrés Ortiz-Pineda, University of Puerto Rico

11.09.2007

The week's most viewed stories

The most popular stories on Earth-Touch in the past week (from Friday 02 November to Thursday 08 November 2007) were:

Number 1

Rhesus monkeys relax in the branches

While adult monkeys groom and scratch, their babies cavort and play in the branches around them.






Number 2

A brush with blacktip sharks

In poor weather and visibility, a pack of blacktip sharks darts about the reef in search of food.




Number 3

Thousands of bats hunt at dusk

In the early evening, thousands of wrinkle-lipped bats leave the cave where they live in Phitsanulok province in north-central Thailand to hunt for insects.


All images © Earth-Touch 2007