Species: Rana aurora
Encyclopedia of Puget Sound
Dorsum brown, gray, olive, or reddish, with irregular dark spotting or blotching; usually has a dark mask above the whitish jaw stripe; adults usually red on lower abdomen and underside of legs; usually coarse blackish, red, and yellow mottling in groin; relatively long legs (heel reaches at least to nostril when extended leg is pulled forward; eyes face outward, well covered by lids when viewed from above; prominent dorsolateral folds; snout-vent length usually 4-13 cm; young may have yellow instead of red on underside of legs and in groin; adult males have enlarged forelimbs and thumb base and more extensive webbing (Stebbins 1985).
Articles:
The Sauk-Suiattle Indian Tribe conducts annual surveys of amphibian egg masses in the Reservation Slough wetland near the Sauk River.
The Northern Red-legged Frog is described here relative to its local behavior, habitat, threats and morphology.
Classification
Amphibia
Anura
Ranidae
Rana
NatureServe
Classification
Ecology and Life History
Dorsum brown, gray, olive, or reddish, with irregular dark spotting or blotching; usually has a dark mask above the whitish jaw stripe; adults usually red on lower abdomen and underside of legs; usually coarse blackish, red, and yellow mottling in groin; relatively long legs (heel reaches at least to nostril when extended leg is pulled forward; eyes face outward, well covered by lids when viewed from above; prominent dorsolateral folds; snout-vent length usually 4-13 cm; young may have yellow instead of red on underside of legs and in groin; adult males have enlarged forelimbs and thumb base and more extensive webbing (Stebbins 1985).