The Pacific tree frog grows up to 2 inches from snout to urostyle.
The males are usually smaller than the females and have a dark patch on their throats.
The dark patch is the vocal sac, which stretches out when the male is calling.
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.
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.
They can change color seasonally to better match their environments.
 Their skin is covered in small bumps.
They have long legs compared to their bodies and they tend to be slender.
Their toes are long and only very slightly webbed.
On the end of each toe is a round, sticky toe pad or disk used for climbing and sticking to surfaces.
Males also have an extra, and far less noticeable toe on their outer thumbs used exclusively in amplexus.
Fertilization is external.
The Pacific tree frog grows up to 2 inches from snout to urostyle. The males are usually smaller than the females and have a dark patch on their throats. The dark patch is the vocal sac, which stretches out when the male is calling. 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. 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. They can change color seasonally to better match their environments.  Their skin is covered in small bumps. They have long legs compared to their bodies and they tend to be slender. Their toes are long and only very slightly webbed. On the end of each toe is a round, sticky toe pad or disk used for climbing and sticking to surfaces. Males also have an extra, and far less noticeable toe on their outer thumbs used exclusively in amplexus. Fertilization is external.
Pacific tree frog