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Upper Midwest Environmental Sciences Center

Farm ponds as critical habitats for native amphibians
A Field Guide to Amphibian Larvae and Eggs of Minnesota, Wisconsin, and Iowa
Field guide contents

Western Chorus and Boreal Chorus Frogs

Western Chorus Frog Pseudacris triseriata
Boreal Chorus Frog Pseudacris maculata

Status: Wisconsin – Common
Minnesota – Common
Iowa – Common
Western Chorus and Boreal Chorus
2.6 - 3.7 cm total length

field mapThe Western Chorus Frog and the Boreal Chorus Frog are difficult to distinguish and have overlapping ranges (Platz 1989). The exact range of the Boreal Chorus Frog has not been determined. Differences in eggs and larvae are unknown and we treat them together in this account. The Chorus Frog is often one of the first frogs to call and lay eggs in the spring. They breed in ponds and smaller bodies of water and lay eggs in loose, irregular clumps of 5–20 eggs (occasionally over 100 eggs) attached to vegetation or debris in shallow water. The tadpoles can be confused with other tree frogs such as Spring Peepers, which also have lateral eyes and a high tail fin. Chorus Frog tadpoles are brownish, black, or gray above and bronze or silvery below, and usually have clear fins with a bicolored tail musculature (dark on the dorsal half, light on the ventral half).

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Page Last Modified: December 29, 2010