Rana pretiosa

Identification Tips:

• Ear drum is smaller than the eye
• Underside of legs red or orange in adults, but skin is not translucent as in Red-legged Frog
• Lacks prominent patch of bright green yellow and black mottling on hip that Red-legged frog has
• Small bumps and larger black spots with blurred edges on back, sides and head
• To 105 mm length, excluding legs

Egg Masses
• Laid in very shallow water (usually <10 cm); often in clusters with masses touching one another • Not attached to anything

Conservation Status:

British ColumbiaCanadaNatureserve
COSEWICSpecies at Risk Act
Red ListEndangeredEndangeredG2, S1

Life History:

• Rarely ever leave the water
• Breed from late February to late March in Fraser Valley
• Often deposit eggs in the same specific locations year after year
• May move hundreds to thousands of meters to breeding sites
• Tadpoles metamorphose in mid to late summer
• Mature in third summer and live for up to 10 years
• Overwinter in springs, beaver dams, or mud in deep open water
• Adults feed on a variety of invertebrates, including mollusks, and larval or juvenile amphibians
• Tadpoles eat algae, organic debris, plant material and plankton


• Permanent water bodies with little or no current and abundant aquatic vegetation; usually larger than 4 ha
• Primarily sloughs and wetlands, but also streams, farm ditches; lakes in United States.
• Breed in open sunny locations in very shallow water, often in seasonally flooded areas,


British Columbia
• Limited to Eastern Fraser Valley (Abbotsford, Chilliwack and Agassiz areas)

• west of Cascade Mountains from Fraser Valley, British Columbia to northern tip of California.


• Several populations in the Fraser Valley are known to have disappeared; Little Campbell River (Langley/Surrey) , and Bertrand Creek (Langley), West Creek (Langley)

Primary Information Sources:
 Efauna BC: http://ibis.geog.ubc.ca/biodiversity/efauna/
 BC Conservation Data Centre: http://a100.gov.bc.ca/pub/eswp/