Comprehensive DescriptionRead full entry This robust frog may be
brown, reddish-brown or red above with a variable number of
large, black spots and blotches on the back, sides, and legs.
The spots are usually irregular-shaped, with indistinct edges
and light centers. The skin on back and sides is often covered
with small bumps and tubercles. The eyes are upturned. The lower
abdomen and the undersides of the hind legs are usually colored
by a reddish-orange or salmon-colored pigment that appears as
though it has been painted on (Leonard et al. 1993; Nussbaum
1984; Stebbins 1985). Oregon spotted frogs have relatively short
hind legs and extensive webbing between the toes of the hind
feet. Sexually mature females range between 60 and 100 mm snout-
vent length and males range between 45 and 75 mm (Licht 1975).
Since nearly the time of its original description in 1853, the
systematics of the "Western Spotted Frog" group has been a
source of both confusion and debate. In 1996, however, a team
led by David M. Green p