Two rare white lion cubs at the Ouwehands Zoo in Rhenen

Two rare white lion cubs play with each other at the Ouwehands Zoo in Rhenen

A tigress lays beside a cub she gave birth to in captivity

A tigress lays beside a cub she gave birth to in captivity, at the Villa Lorena animal refuge center in Cali

Twin panda cubs sit in an incubator at the Wakayama Adventure World at Shirahama

Twin panda cubs sit in an incubator at the Wakayama Adventure World at Shirahama, southwestern Japan.

Orangutan Hanama cuddles these two baby lion cubs as he plays dad to the young pair.

Orangutan Hanama cuddles these two baby lion cubs as he plays dad to the young pair.

Two 6-week-old black panther cubs are shown off to the media at the Tierpark zoo

Two 6-week-old black panther cubs are shown off to the media at the Tierpark zoo in Berlin, Germany

Four white tiger cubs following the first medical examination of the cubs

 Four white tiger cubs following the first medical examination of the cubs at the 'Serengeti' Safari Park in  Hodenhagen

Mohan one of two 8 week old white-stripe tiger cubs chews on the ear of his brother Majestic

 Mohan one of two 8 week old white-stripe tiger cubs  chews on the ear of his brother Majestic at Siegfried & Roy's Secret Garden and Dolphin Habitat