Apparently the Pacific Tree Frog is Washington’s only chorus frog and Washington’s State Amphibian. It is found from Northern California to southern Alaska (where they may have been introduced). Most active at night, this frog is often common and is found in a variety of aquatic habitats. They can change color, ranging from green to brown. They are identified by the black line from their noses to their shoulders. We found this tree frog at the Nisqually National Wildlife Refuge.