Will Ericson loves exploring the reaches of the wild Gualala River. A while back he discovered this juvenile frog, a Foothill Yellow-legged Frog, Ranas Boylii. You will see it is not much bigger than a quarter.

Here it is in one of the tributaries of the Gualala River.

 And here is an adult Foothill Yellow-legged Frog photographed by Peter Baye. You can see that it blends in well with the rocks in the river.

They are found in Oregon, along the California Coast and down to Baja California. To see another frog, the Pacific Tree Frog, here is the link:
http://www.mendonomasightings.com/2011/10/21/a-tiny-frog-with-a-big-voice-meet-the-pacific-tree-frog/