The Pacific tree frog lives on the West coast of the United States, in British Columbia, and southern Alaska.  This frog has been reclassified and is now known as the Pacific chorus frog.  The decision to reclassify was determined by the shape and color of its testes and that it breeds during cold months.  Those traits are common for the chorus frog. A Pacific chorus frog can be either a shade of green or brown.  Like other frogs, the time it takes to change color can vary depending on its surroundings.  This amphibian is distinguished by the dark stripe-like mask that extends across its eyes and all the way back to its shoulder.  It is a small frog, ranging from 1-2 inches in length.  The Pacific chorus frog's body size can adjust based on the size of the insect it is eating. When this frog mates, the male migrates to water and calls.  It is so loud, the sound is like multiple frogs calling at once.  Sometimes multiple females show up, but once a female arrives, the male stops calling. Nearly all Americans have heard the call of this little frog, even if they didn't realize it.  This is due to Hollywood being right in the Pacific chorus frog region.  Its call has been recorded on Hollywood films for decades.  So even on the East Coast, one can still listen to the beautiful call of this boisterous little frog.