How do scientists monitor the populations of the threatened California red-legged frog? With careful listening and a little ...

The creatures, which had not previously been seen in the Santa Monica Mountains for decades, also were threatened by storms, experts say.

The L.A. Zoo bred, raised, and released the southern mountain yellow-legged frogs and tadpoles into their native ecosystem ...

The Phoenix Zoo recently released 1,000 tadpoles into the Tonto National Forest, part of a program to save the threatened Chiricahua leopard frog.

Crawfish frog numbers are on decline due to habitat loss. But scientists in Indiana are working to return species to a historic site.