The Pacific chorus frog - Pseudacris regilla, our most common native frog in the region and one that people will hear all over the region in the Spring. Non-native American bullfrog - Lithobates ...

A main distinction: the California red-legged frog has paired vocal sacs, while its northern cousin lacks vocal sacs altogether. DESCRIPTION: The largest native frog in the American West, the ...

The first species ever to be emergency-listed as an endangered species in Canada, the Oregon spotted frog was on the U.S. candidate list for 23 years before it federal protection in the United States.