Ranidae

From The Economist

The idea of saving for a rainy day originated with farm hands whose work depended on the weather. Conservationists are thinking similarly about climate change and freezing the cells of threatened animals as a sort of insurance policy. One problem is that the cells of amphibians—among the animals most endangered by a warming world—have seemed almost impossible to preserve. That may change.
Read more in the Economist.

From the AWeb site:

The Center for Biological Diversity last week petitioned the California Fish and Game Commission to list all populations of mountain yellow-legged frogs (Rana muscosa, in the southern Sierra and Transverse Ranges, and Rana sierrae, in the central and northern Sierra) as endangered.