Kurt Benirschke started collecting skin samples from rare and endangered animals in 1972. Now, decades later, he moved his collection to San Diego Zoo, and called it the Frozen Zoo. As of now, the Frozen Zoo is the world's largest animal cryobank, with samples from over 10,500 individual animals from 1,220 species. Check out the full article below to learn about how they plan to use the samples to grow the population.

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