Three zebras stand together in the zoo in Frankfurt, central Germany. Photo Michael Probst/AP.
A polar bear sleeps in his enclosure at the Zoo in Wuppertal, Germany. Photo Martin Meissner/AP.
A baby Hoffman's two-toed sloth whose sex is not yet known is seen atop its mother Charlotte at the Philadelphia Zoo in Philadelphia, US. Photo Matt Rourke/AP.
A buffalo looks for something to eat in blowing snow at the Terry Bison Ranch, south of Cheyenne, Wyoming, US. Photo Michael Smith, The Wyoming Tribune Eagle/AP.
A kangaroo is seen at the zoo in Heidelberg, southwestern Germany. Photo Daniel Roland/AP.
A new born black panther cub seen in the grass at the Tierpark zoo, during a presentation to the media in Berlin, Germany. Photo Maya Hitij/AP.
Department of Wildlife and National Parks officer Ahmad Julaihi nurses "Tattoo" a seven month old baby orangutan at his offices in Kuala Lumpur, Malaysia. Photo Mark Baker/AP.
Seal pups look out of the pool's water at the seal station in Friedrichskoog at the North Sea, northern Germany. Photo Heribert Proepper/AP.
A baby male killer whale named 'Earth' and his mother 'Lovey' look up during their performance at Kamogawa Sea World in Kamogawa, east of Tokyo, Japan. Photo Itsuo Inouye/AP.
A seal wears sunglasses during a solar eclipse event at Sunshine International Aquarium in Tokyo, Japan. Photo Itsuo Inouye/AP.