Sierran Tree Frog 2016

Half Moon Bay, California 2016

Adults are .75 - 2 inches long from snout to vent (1.9 - 5.1 cm). (Stebbins, 2003)

A small frog with a large head, large eyes, a slim waist, round pads on the toe tips, limited webbing between the toes, and a wide dark stripe through the middle of each eye that extends from the nostrils to the shoulders. Legs are long and slender. Skin is smooth and moist. Often there is a Y-shaped marking between the eyes.

Color and Pattern
Dorsal body coloring is variable: green, tan, brown, gray, reddish, cream, but it is most often green or brown. The body color and the dark eye stripe do not change, but the body color can quickly change from dark to light, and dark markings on the back and legs can vary in intensity or disappear in response to environmental conditions. The underside is creamy with yellow underneath the back legs.

Male/Female Differences
The male's throat is darkened and wrinkled.

Similar to adults.

Larvae (Tadpoles)
Tadpoles are up to 1 7/8 inches long ( 4.7 cm) blackish to dark brown and light below with a broze sheen. The intestines are not visible. Viewed from above, the eyes extend to the outline of the head.

Active both day and night, becoming mostly nocturnal during dry periods.

During wet weather, they move around in low vegetation. In locations at low elevations where temperatures are more moderate, frogs may be active all year. At colder or hotter locations, frogs avoid temperature extremes by hibernating in moist shelters such as dense vegetation, debris piles, crevices, mammal burrows, and even human buildings.

The name "treefrog" is not entirely accurate. This frog is chiefly a ground-dweller, living among shrubs and grass typically near water, but occasionally it can also be found climbing high in vegetation. Its large toe pads allow it to climb easily, and cling to branches, twigs, and grass.

Green body color absorbs more solar radiation which can be more beneficial in cold and aquatic habitats.

Brown body color absorbs less solar radiation, which may be more beneficial in drier, hotter, more terrestrial habitats.

Sierran Treefrog Range

Range Map

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