The Columbia Spotted Frog and the Oregon Spotted Frog (Rana pretiosa) were long considered members of the same species. While tough to tell apart, these two frogs have non-overlapping ranges (live in different areas)
and can be identified by where they are found. The Columbia Spotted Frog is a mediumsized frog with irregular black spots, usually light-centred, on the head, back, sides and legs. Adult frogs can be green, brown or reddish-brown while juveniles are brown or olive green. Two dorsolateral folds (ridges of skin) run from the frog’s head partway along the back. The eyes are set so that they are angled slightly upwards, like those of the Oregon Spotted Frog.
Undersides tend to be cream-coloured with mottled reddish or salmon-coloured pigmentation on the lower
abdomen and hind-legs, but can also be yellow in some populations. Adult females are slightly larger than
the males and can grow to a length of 5 to 10 centimetres (snout to rump). Webbing on the feet extends to
the ends of the toes. Tadpoles are dark brownish-green, with gold flecks above and iridescent yellow to bronze below. Intestines are visible through the skin, and the broad-finned tail is often twice the length of the body.
Ministry of Water, Land and Air Protection. 2002. Columbia Spotted Frog (frogwatch factsheet). Ministry of Water, Land and Air Protection. Frogwatch factsheet. 10