A lion yawns at a nature reserve on the outskirsts of Pretoria, South Africa June 29, 2010.

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A White Peacock (Anartia Jatrophae) butterfly, a native of North and Central America, clings to a plant at the American Museum of Natural History's Butterfly Conservatory exhibit in New York.

A dog pauses during a dip in a lake in Battersea Park in London

An erect-crested penguin watches as Richard Tesore, head of the NGO Rescate Fauna Marina, holds a baby La Plata river dolphin in Piriapolis, 100 km (62 miles) east of Montevideo. The dolphin, which was found on the beach in the city, is recovering at the reserve from injuries believed to have been caused by a fishing net.

A Taipei tree frog climbs a leaf in Tucheng, Taipei County

Japanese macaques gather on a tyre at Sapporo Maruyama Zoo in Sapporo, northern Japan

A stag calls during the rutting season at Bradgate Park in Newtown Linford, central England

A researcher dressed in a panda costume puts a panda cub into a box before its physical examination at the Hetaoping Research and Conservation Center for the Giant Panda in Wolong National Nature Reserve, Sichuan province. The 4-month old cub, the first in the centre to be trained for reintroduction into the wild, is monitored by hidden cameras. Researchers performing physical examinations on the cub wear panda costumes to ensure that the cub's environment is devoid of human influence, according to local media.

A hippopotamus calf swims near her mother Kathi in the zoo in Berlin. The yet unnamed female calf was born in the zoo. The bird in the background is a Nile Duck.

Surfdog Abbie catches a wave on her surfboard during a training session at dog beach in Del Mar, California. The popular San Diego area contest, like many of the growing number of dog surfing events being held in southern California each year, is a fundraiser for pet-related charities.

Baby sparrows cry out from a nest in Russia's city of Vladikavkaz

A Chihuahua in a cowboy dress walks on catwalk during a dog fashion show at the Animalia pet fair in St.Gallen, Switzerland

A white Tiger cub hisses during a photocall at the 'Serengeti' Safari park in the northern German village of Hodenhagen

Kijivu, a western lowland gorilla, holds her newborn baby at Prague's zoo in Prague. Kijivu, 16, had her first offspring, a female named Moja in December 2004, followed by a male named Tatu in spring the 2007, according to local media reports.

An Andalusian horseman washes his Spanish thoroughbred horse before their performance during the Sacab Andalusian Horse Show in Coin, near the southern Spanish city of Malaga

One-year-old polar bear Ikor plays at Sapporo Maruyama Zoo in Sapporo, northern Japan