Pacific Tree frog
The Pacific tree frog (Pseudacris regilla), also known as the Pacific chorus frog, has a range from the West Coast of the United States (from Northern California, Oregon, and Washington) to British Columbia in Canada and extreme southern Alaska. They occur in shades of greens or browns and can change colors over periods of hours and weeks. A rare, recessive “blue morph” is known. This mutation might inhibit the xanthophores’ ability to produce yellow pigments, thus the normally green frog appears blue.