Ranges from southwestern Oregon through most of northern and central California, mostly in coastal regions but also in the western foothills of the Sierra Nevada Mountains.
This species prefers the rocky edges of fast-flowing freshwater streams and rivers, where lots of sun is present.
A smallish frog with rough, granulated skin and coloration that matches its rocky surroundings. It averages 1.5-3.25 inches in length, has horizontal pupils, and is known for jumping into rapidly moving water. It's named for yellow coloration occurring on the insides of the hind legs, and sometimes the abdomen. It often has faint banding on the legs, and a pale ventrum with dark mottling on the throat and chest. It has full webbing on the toes of the hind feet.
Learn more with Schechter Natural History's Guide to Reptiles and Amphibians