The week in wildlife

Black-legged kittiwakes nest on the cliffs of Kongsfjord, near the scientific base at Ny-Ålesund on the west coast of Spitsbergen, Norway Photograph: Martin Bureau/AFP/Getty Images Photograph: Martin Bureau/guardian.co.uk A female vervet monkey jumps from a pine tree in the town of Balgowan in Kwazulu-Natal province, near Paraguay's World Cup base camp Photograph: Juan Mabromata/AFP/Getty Images Photograph: Juan Mabromata/guardian.co.uk Oil-covered brown pelican chicks stand in contrast to clean chicks on Cat island, Louisiana. The Deepwater oil spill took place right in the middle of breeding season, and hatchlings are now sitting in marshland nests waiting to be fed, wildlife experts say Photograph: Charlie Riedel/AP Photograph: Charlie Riedel/guardian.co.uk A queen bee (centre) surrounded by her worker bees at a farm in Macedonia Photograph: Ognen Teofilovski/Reuters Photograph: Ognen Teofilovski/guardian.co.uk A bar-tailed godwit. Satellite telemetry has recently demonstrated that these birds make one non-stop flight of 11,000km between Alaska and New Zealand during autumn migration Photograph: Lars Hedenstršm Photograph: guardian.co.uk A sea turtle covered in oil from the Deepwater Horizon oil spill swims off Grand Terre island, Louisiana. Oceana, the ocean conservation organisation, released a new report this week warning that the spill is proving extremely dangerous for sea turtles. Turtles can become coated in oil or inhale volatile chemicals when they surface to breathe, swallow oil or contaminated prey, and swim through oil or come in contact with it on nesting beaches Photograph: Lee Celano/Reuters Photograph: Lee Celano/guardian.co.uk The clearwing butterfly ( Cithaerias menander ) is found in central and South America lowland rainforests. Scientists have studied the species using traps to find out more about how long it lives, the size of its range and the genetic structure of the population Photograph: Phi DeVries Photograph: guardian.co.uk The satellite transmitter fitted to this 4.8m (16ft) estuarine crocodile revealed it had travelled over 590km (367 miles) by sea. Crocodiles 'surf' ocean currents to cross huge distances of open sea, scientists learned this week . The discovery explains how the world's largest living reptile came to occupy so many South Pacific islands despite having little stamina for swimming Photograph: Australia Zoo/PA Photograph: Australia Zoo/guardian.co.uk A great white shark breaches out of the water in an attempt to catch a seal in False Bay, 30km south of Cape Town, South Africa Photograph: Alfred Weissenegger/Rex Features Photograph: Alfred Weissenegger/guardian.co.uk Male fiddler crabs that see a receptive female wave their single, greatly enlarged claw in a highly conspicuous courtship display. But scientists found this week that other males 'eavesdrop' on their competitors' courtship displays to detect potential female mates for themselves Photograph: Tanya Detto Photograph: guardian.co.uk An Arctic fox in the Svalbard archipelago Photograph: Martin Bureau/AFP/Getty Images Photograph: Martin Bureau/guardian.co.uk An adult Sumatran orang-utan watches the crowd from its perch at the Como zoo, in St Paul, Minnesota. Researchers from Melbourne zoo found this week that orang-utans like to people-watch in return Photograph: Jim Mone/AP Photograph: Jim Mone/guardian.co.uk A female North American red squirrel moves an orphan newborn to a new nest. A study by the University of Guelph in Canada last week found that red squirrels will adopt pups that have lost their mother - surprising behaviour for a species that is known to be asocial Photograph: Ryan W. Taylor/redsquirrel.ca Photograph: Ryan W. Taylor/guardian.co.uk Smooth snakes ( Coronella austriaca ) mating in Dorset, Britain. Scientists in five countries across three continents reported this week that they had found 'alarming' declines in snake numbers after monitoring 17 populations in a variety of habitats – something they believe could be part of a global phenomenon Photograph: Tony Phelps/Nature Picture Library / Rex Features/Rex Features Photograph: Tony Phelps/Nature Picture Library / Rex Features/guardian.co.uk Baby sparrows cry out from a nest in Vladikavkaz, Russia Photograph: Kazbek Basayev/Reuters Photograph: Kazbek Basayev/guardian.co.uk A rare fungus - Multiclavula vernalis - has been sighted in England for the first time. The fungus, which forms a tiny, orange fruiting body, was found in British Army training land in Hampshire. Experts from the Royal Botanic Gardens at Kew confirmed the fungus's identity Photograph: Leif Goodwin/The Wildlife Trusts Photograph: Leif Goodwin/guardian.co.uk