Lithobates clamitans melanota,
formerly Rana clamitans melanota
Northern Green Frog / Grenouille verte du Nord
The Northern Green Frog is a large, true frog with large, distinct
tympanum and prominent
dorsolateral ridges. It may be
green, bronze or brown, or a combination but is typically green on the upper lip. The
belly is white with darker lines or spots. There may be some irregular spotting on
the back. It is distinguished from other frogs in that the dorsolateral ridges run
only partway down the back and do not reach the groin. The hind legs have dark bars.
Males have a bright yellow throat. Maximum adult size is 10 cm.
of the Northern Green Frog is a deep twangy "gung" like a loose banjo string. It
is similar to that of the Mink Frog, but more twangy and not repeated in rapid groups.
Bullfrogs are superficially similar
although they lack dorsolateral ridges and are much larger as adults.
Mink Frogs may also be confused
with Northern Green Frogs although the former has a yellowish belly, a musky odour and eyes
slightly upturned. Mink Frogs also do not have bars on the hind legs.
The Northern Green Frog is native to Manitoba, Ontario, Qué‚bec, New Brunswick, Nova
Scotia and Prince Edward Island. It has been introduced to Newfoundland and British
Columbia. It is widely distributed in the eastern half of the United States.
Northern Green Frogs are most commonly found in or near shallow, permanent water such as
springs, swamps, brooks and pond and lake edges.
Northern Green Frogs begin calling in late spring to mid-summer and may breed as late as
August. Three or four small clutches of eggs are draped over submerged vegetation
in permanent water. Tadpoles overwinter in water before transforming the following
summer. Because of the extended breeding season and long larval period, tadpoles of
various sizes and newly transformed frogs can be found during most of the spring and
Northern Green Frogs are quite aquatic although they may be seen basking on the shores of
ponds, lakes and creeks. They eat a wide variety of insects and other invertebrates.
Northern Green Frogs hibernate under water.
This species is widespread and apparently stable although it is rare in Manitoba.
Northern Green Frogs are introduced to British Columbia and Newfoundland.