Wisconsin Sea Grant: Frog Field Guide
Call: A low, rumbling snore occasionally interspersed
with little barks; when seized by a predator, can give a loud scream
Size: 5-11.1 cm in length (2-4.4 inches)
Green, greenish-brown, or brown with rounded, dark spots scattered over
the back and sides; the spots may have whitish or yellowish borders; usually
a dark spot over each eye and the snout
Found in open habitats like marshes, bogs, lakes, fields and suburban
lawns; found throughout the Great Lakes region, but fairly uncommon or
The Pickerel Frog has squarish spots arranged in two rows down the back
and also has bright yellow or bright orange on the groin area and under
the hind legs.
Breeding: Late March - early May
FACT: In the past 50 years, humans have used a lot of chemical
pesticides and herbicides
to boost agricultural production and for other reasons. One problem, however,
is that some of these chemicals stick around for a very long time in the
air, soil and water, and they can be harmful to animals like frogs.
Did you know?
The Northern Leopard Frog was probably the most abundant
frog species in the Great Lakes region before 1970, but since that time
many scientists and naturalists have noticed a sharp decline in its population.
Why is that? There are probably several reasons.
First, the Leopard Frog has been commonly used as fishing
bait and in biology classroom laboratories for dissection.
Second, the loss of wetlands
and other habitat throughout the region
has undoubtedly affected the Leopard Frog, as it has many other frog species.
Third, Leopard Frogs, like other frogs, are sensitive to
chemical pollutants in the air and water.
copyright 2001 University
of Wisconsin Sea Grant Institute