sentences:  At the time there was no technology available to make use of the collection, but Benirschke believed such technology would be developed in the future.The frozen zoo idea was later supported in Gregory Benford's 1992 paper proposing a Library of Life.Zoos such as the San Diego Zoo and research programs such as the Audubon Center for Research of Endangered Species cryopreserve genetic material in order to protect the diversity of the gene pool of endangered species, or to provide for a prospective reintroduction of such extinct species as the Tasmanian tiger and the mammoth.