Take note, parents: The next time you take your kids to the zoo, if you really want to give them the full experience, be sure to tell them that behind all those cages full of super happy animals, zoos have vials upon vials of animal sperm.  That’s right — vials of frozen elephant sperm might not be as exciting as Dumbo himself, but they’re just as important to wildlife conservation. As Elizabeth Kolbert, author of The Sixth Extinction, discussed in her interview with Grist last year, scientists are hoping to use all that frozen goo to keep endangered species alive through artificial insemination.

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