Effigy Mounds' abundant wetlands are habitat for a chorus of amphibians. In early spring, the chirping of various frogs arises from the ponds and marshes as they begin their courtship ritual. Bullfrogs, American toads, leopard, pickerel, green and western chorus frogs, along with spring peepers lend their voice to the fray. Nearby the common gray treefrog puts in his two cents worth.
Amphibians, as a bioindicator species, are sensitive to changes in water quality and habitat degradation. This habitat degradation is a common reason for the decline in amphibian numbers that is being experienced across the Midwest. Unlike mammals, it is difficult for amphibians to travel overland in search of better living conditions. Local populations are vulnerable to human crises such as chemical or pesticide spills or misuse.
