Julie Feinstein, Manager of the Ambrose Monell Collection at the American Museum of Natural History, shows off a cryovat filled with liquid nitrogen that’s used for storing frozen tissue samples from endangered speci

NEW YORK, NY July 07, 2009 —Tissue samples from endangered species will now be stored at the Museum of Natural History, under a new agreement with the U.S. Parks Service. The museum already freezes its own samples taken from whales, butterflies, and other creatures in seven cryovats. They look like giant, stainless steel thermoses, except they're not filled with coffee, they're filled with liquid nitrogen.