The week in wildlife

A white crab spider waits for prey to become entangled in the fine threads placed on the blossom of a blue princess flower in Hanover, Germany. Princess flowers have dark, strangely formed stamens that look like a spider lying on its back, which gave them the name 'spider flowers' in their South American native areas Photograph: Jochen Luebke/EPA

A one-horned rhino takes refuge on high land near a high voltage electric pole inside the flooded Pobitora wildlife sanctuary in India. During the flood time rhinos become easy target of poachers. The third wave of flooding has submerged more than 90% of the wildlife sanctuary and majority of the animals have taken shelter in the high lands Photograph: STR/EPA

A record-breaking 429 white-shouldered ibis have been recorded in Cambodia by the University of East Anglia, making the known global population much larger than previously thought. With so many birds remaining in the wild the chances of conservation success are greatly improved – welcome news for this critically endangered bird species Photograph: Hugh Wright/UEA

A newly hatched Yangtze alligator in China Photograph: JIANAN YU/REUTERS

Flowers on the side of a dusty road in the Atacama desert that leads to the San Jose mine where 33 miners are trapped deep below ground Photograph: Ariel Marinkovic/AFP/Getty Images

A frog is camouflaged among leaves on the Tiputini river at the Yasuni national park. Ecuador is launching a one-of-a-kind initiative to protect a jungle reserve in the park that contains not only a huge variety of plants and animals but 20% of the country's crude oil Photograph: Guillermo Granja/Reuters

The eye of a black caiman, Ecuador Photograph: Guillermo Granja/Reuters

Great bowerbirds are known for their dramatic and elaborate constructions with decorative objects such as pebbles, bones, and shells to attract a mate. But researchers have discovered a new dimension to these showy structures: males of this species build staged scenes that make themselves look larger or smaller than they actually are. Scientists believe great bowerbirds are the first known non-human animals that create scenes with altered visual perspectives for viewing by other individuals Photograph: Michael & Patricia Fogden/Corbis

Moray eel and black cup coral in the Alabama Alps, Gulf of Mexico. The final solution to BP's oil well spill could be in place by Sunday, five months after the deadly explosion spewed 5m barrels of crude into the Gulf, the Obama administration said this week Photograph: Oceana

An overall view of a massive fish kill in the Bayou Chaland area of Plaquemines Parish. The cause of the fish kill has not yet been determined, but the area they were discovered in was impacted by oil from the BP oil spill. Among the fish dead were pogie fish, redfish, shrimp, crabs and freshwater eels Photograph: HO/Reuters

An elephant shrew in north-eastern Kenya is caught up by ZSL's phototrap. It is thought to be a new species. Weighing in at 600g, the two-foot long creature is unusually large compared with other species Photograph: Zoological Society of London

Representatives from Kazakhstan, Mongolia, Russia, Turkmenistan, Uzbekistan and UN bodies meeting in Ulaanbaatar, Mongolia, have agreed an international conservation pact for the migratory saiga antelope. Saigas numbered around 1 million animals in the early 1990s, but declined to between 60,000 and 70,000 in 2006, largely due to a sharp rise in poaching after the collapse of the former Soviet Union. The horns of males are in high demand for traditional Asian medicine, especially in China and parts of south-east Asia Photograph: Alamy

The researcher Tony Fischbach observes hundreds of walrus as they cover the US shores of the Chukchi Sea near Point Lay, Alaska. Scientists in the Arctic are reporting a rare mass migration of thousands of walrus from the ice floes to dry land along Alaska's coast. Experts fear declining Arctic sea ice may have caused an unprecedented mass migration to dry land Photograph: USGS/EPA

The first confirmed sighting of a saola, one of the world's rarest animals, in Laos. The animal, called the 'Asian unicorn', died after villagers took it into captivity in a remote region of Laos, conservationists said Photograph: Bolikhamxay Provincial Conservat/PA