How, in fact, do we count tigers?

Scientists at San Diego Zoo Global’s Frozen Zoo® have achieved a major milestone in saving wildlife species: This unique collection of genetic material now contains 10,000 individual cell lines from more than 1,100 species and subspecies—some of them critically endangered. 

Wildlife care specialists are working with the African elephant herd at the San Diego Zoo Safari Park to find out more about a disease that was recently identified as a threat to the species.