Survival for some endangered species hinges on 'Frozen Zoo'

In this Friday, Jan. 2, 2015 photo, Barbara Durant, director of reproductive physiology at the San Diego Zoo Institute for Conservation Research, a.k.a. the Frozen Zoo, removes vials of frozen cells from a liquid nitrogen-cooled stainless steel container at the Beckman Center at the San Diego Zoo's Safari Park in Escondido, Calif. In this Dec. 31, 2014 photo, Nola, a 40-year-old northern white rhino who is only one of five remaining of the species, wanders around her enclosure at the San Diego Zoo Safari Park on a cold winter day in Escondido, Calf.

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