The Wood Frog is a member of the Brown Frog division of the genus Rana . It is the smallest group in the genus and rarely grow to a length greater than 65 mm in their Canadian range. They are generally brown or grey but the females in particular could be a distinct red colour.
All individuals have various distributions of black spots on their dorsal side.
The two distinguishing characteristics of these animals is their black triangular mask between their eyes and the light stripe that extends down the centre of their backs. The Wood Frog group is one that is able to tolerate much colder temperatures than its relatives. It can be found in every Canadian province and in the Yukon and Northwest Territories. The breeding process is generally complete by the beginning of May at which time the individuals disperse into the surrounding woodlands. A Field Guide to Reptiles and Amphibians of Eastern and Central North America.