They can also be found in Idaho and Montana. Pacific tree frogs are common on the Pacific coast of Oregon and Washington, but they are found from extreme northern California to British Columbia. Fertilization is external.ĭistribution, habitat and ecology Males also have an extra, and far less noticeable toe on their outer thumbs used exclusively in amplexus. On the end of each toe is a round, sticky toe pad or disk used for climbing and sticking to surfaces. Their toes are long and only very slightly webbed. They have long legs compared to their bodies and they tend to be slender. They can change color seasonally to better match their environments. They have a variety of dark and spotty markings on their backs and sides and can be identified by a black or dark brown eye stripe that stretches from the nose, across the eye, and back to the shoulder. Pacific tree frogs can be a number of different colors, including green, tan, reddish, gray, brown, cream, and black, but most are a shade of green or brown, with pale or white bellies. The dark patch is the vocal sac, which stretches out when the male is calling. The males are usually smaller than the females and have a dark patch on their throats. The Pacific tree frog grows up to two inches from snout to urostyle. This revision has been controversial but the evidence is supported by other research (e.g., ), and is followed in this article.Īnatomy and morphology A Pacific tree frog (green morph) sitting on a sunflower leaf stem, Nanoose Bay British Columbia used incorrect names for two of the three populations, but subsequent authors established that the correct name (i.e., the oldest available name) for the northern component is Pseudacris regilla, for the central one Pseudacris sierra, and for the southern one Pseudacris hypochondriaca. split the frog into three species based on DNA evidence. First, the frog was moved from the genus Hyla to the genus Pseudacris in 1986, and Hyliola in 2016 (an elevation of the subgenus which has not been widely accepted). The taxonomy of this frog has a very confusing history. They occur in shades of greens or browns and can change colors over periods of hours and weeks. They live from sea level to more than 10,000 feet in many types of habitats, reproducing in aquatic settings. The Pacific tree frog ( Pseudacris regilla), also known as the Pacific chorus frog, has a range spanning the Pacific Northwest, from Northern California, Oregon, and Washington to British Columbia in Canada and extreme southern Alaska.
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