How, in fact, do we count tigers?

Amahle, the San Diego Zoo’s youngest river hippo, is growing rapidly—and she’s already showing her curious side, exploring her habitat and seeking out new areas to investigate when her mom, Funani, isn’t right by her side.

A koala moved quickly out of a caretaker’s arms and up into a tall eucalyptus tree, while wildlife care specialists looked on. This koala is a member of an important group of the species that returned to their home in the Blue Mountains of Australia this past weekend.