Survival for endangered species hinges on 'Frozen Zoo'

SURVIVAL OF THE SPECIES: A four man anti-poaching team permanently guards a Northern White Rhino on Ol Pejeta Conservancy in Kenya, 2011. Whenever an endangered animal dies at the San Diego Zoo, researchers race out, regardless of the hour, to remove its sperm or eggs, maybe a bit of ear or eyeball, and carefully freeze the cells in liquid nitrogen.

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