Red-legged Frogs live here, in scraps of forest within Fraser valley farmland. The Canada-US border runs along the hills on the south side (the narrow line cut through the trees extending up from the right side).
Conversely, perhaps perversely, two non-native frogs are doing quite well throughout the former ranges of the two native Rana species. The Green Frog, Rana clamitans is an eastern species similar in size to the Oregon Spotted Frog and Red-legged Frog, and seems to thrive in any permanent pond or ditch. Its deadened banjo-string "twang" can be heard on warm spring and summer days. The Bullfrog, Rana catesbeiana , also an easterner, has made itself at home throughout western North America and elsewhere, descendants of releases from ill-conceived farms (frogs’ legs), and other human insanity. Both species, particularly the much larger Bullfrog, may be involved in the elimination of populations of native species, through competition or predation. Introduced fish may also prey on tadpoles in permanent bodies of water. These zoological factors combine with the overriding issue of habitat loss in a way that is not fully understood. It is understood, though, that things aren't looking rosy for the Red-legged Frog.
Adams, M.J. 1999. Correlated Factors in Amphibian Decline: Exotic Species and Habitat Change in Western Washington. Journal of Wildlife Management, Vol. 63: 1162-1171.