How, in fact, do we count tigers?

Researchers from San Diego Zoo Global and Embryo Plus South Africa performed an ovum pick-up (OPU) procedure on Nikita, a 9-year-old female southern white rhinoceros at the San Diego Zoo Safari Park’s Nikita Kahn Rhino Rescue Center, on March 6.

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.