“Frozen Zoo Offers Last Chance for Some Species.” This was the headline from a February 12 Fresno Bee story. According to the article, San Diego Zoo researchers have spent 40 years amassing genetic material from 1,000 different species. These are all preserved in nitrogen-cooled, stainless steel vats—thus the Frozen Zoo moniker.

One of the most critical cases is that of the northern white rhino. Only five animals remain in the world,…

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