Serbia's Belgrade Zoo welcomed two white lion cubs in December. White lions have a rare color mutation; they're not albinos.

In the wild, they live only in the Timbavati area of South Africa (although most white lions in the world today are in zoos).

Photographer Srdjan Ilic captured one of the cubs, Kasper (right), having a great time with zookeeper Nadja Radovic.

--Lindsay Barnett

Photo: Srdjan Ilic/Associated Press