Protecting and enhancing the natural values of Salt Spring Island and its surrounding waters


Northern Pacific Treefrog

>>>>Northern Pacific Treefrog

Northern Pacific Treefrog

Northern Pacific Treefrog, Pseudacris regilla

Northern Pacific Treefrog, Pseudacris regilla, (formerly Pacific Treefrog, Hyla regilla) breeds in a variety of temporary and permanent ponds and wetlands with emergent vegetation. It is the frog most often heard in our area in the spring, as males loudly announce their presence to potential mates and competitors. These frogs are small, with body length of adults from 25 to 50 mm; newly metamorphosed young are only about 10 mm long. Each digit ends in an enlarged adhesive toe-pad, which is diagnostic. The body is relatively smooth, without longitudinal folds on the sides. The colour of the back and sides is highly variable, ranging from green to brown and black and from solid to striped or mottled. A dark facial stripe extends from each nostril across the eye to the shoulder.  Eggs are laid from early spring to early summer during a prolonged breeding season. They are in small, usually 5 cm or less in diameter, soft, oblong clusters, attached to submerged vegetation or debris. Individual eggs are small (1.5 mm or less in diameter) and surrounded by a thin jelly coat, making eggs in a cluster appear closely packed. The number of eggs within a cluster ranges from 10 to 80, and a female may lay multiple clusters within one breeding season.  Tadpoles vary in colour from greenish to tan and dark brown with indistinct mottling and brassy flecking on the back and sides. The sides may have a metallic bluish tint. The underside is whitish or silvery and unmarked. When viewed from above, the body is somewhat square in shape, and the eyes are at the sides, protruding beyond the dark outline of the head.