Frogs and toads compose the Order Anura, the tail-less amphibians. Together, they make up 85% of the amphibians in the world
and they are found on every continent except Antarctica.
True frogs belong to the Family Ranidae and in North America are limited to the Genus Rana. Frogs can be distinguished from
toads on the basis of several characteristics:
- lack of very warty skin
- lack of a parotoid (poison) gland on the shoulders
- lack of prominent tubercles (knoblike projections) on their hind feet
- extensively webbed hind feet
- presence of dorsolateral folds (ridges) along each side of the back
In Alberta, there are three true frogs:
- northern leopard frog
- spotted frog
- wood frog
In addition to Alberta’s three true frog species, there is one tree frog, the boreal (or striped) chorus frog.
The boreal chorus frog looks very "froglike" but it lacks the dorsolateral folds along its back and webbing between its
toes found in true frogs.
Posted: Oct 9, 2009