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Share your observations of plants or non-game animals with the Natural Heritage Inventory.

Rare animals
Find rare and non-game animals.
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Learn about plants on the Natural Heritage Working List.
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Other features
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Contact information
For information on Wisconsin's rare animals, contact:
Rich Staffen
Conservation Biologist
608-266-4340

American Bullfrog (Lithobates catesbeianus)


Overview

Overview

American Bullfrog (Rana catesbeiana), a State Special Concern frog, may be found throughout Wisconsin in any permanent body of water - lakes, ponds, rivers, and creeks, although they have a very patchy distribution. In Wisconsin, bullfrogs appear to favor oligotrophic to mesotrophic waters, often breeding where dense submergent vegetation filters out the majority of the suspended solids. Adult bullfrogs overwinter in water to avoid freezing. Bullfrogs are active from April through mid-October. They breed from mid-May through late July or later. Larvae overwinter before transforming the following year or, or in rare situations, in their second full year. This species is not actively tracked in the Natural Heritage Inventory Database, but it could be tracked in the future if there is further evidence of its decline.

State status

Status and Natural Heritage Inventory documented occurrences in Wisconsin

The table below provides information about the protected status - both state and federal - and the rank (S and G Ranks) for American Bullfrog (Lithobates catesbeianus). See the Working List Key for more information about abbreviations. Counties shaded blue have documented occurrences for this species in the Wisconsin Natural Heritage Inventory database. The map is provided as a general reference of where occurrences of this species meet NHI data standards and is not meant as a comprehensive map of all observations.

Note: Species recently added to the NHI Working List may temporarily have blank occurrence maps.


Lithobates catesbeianus is not tracked by the Wisconsin Natural Heritage Inventory Program at this time (this species is not on the NHI Working List).
Summary Information
State Statusnone
Federal Status in Wisconsinnone
State RankS3S4
Global RankG5
Tracked by NHIW
WWAP m-SIN

Species guidance


A guidance document is not available at this time. Use the information from the other tabs and contact local biologists, as needed, to develop management and avoidance strategies.

Photos/Video

Video

Photos


American Bullfrog

Bullfrog with northern leopard frog.

Photo © Randy Korb.

American Bullfrog

Bullfrog with northern leopard frog.

Photo © Randy Korb.

American Bullfrog

Bullfrog with northern leopard frog.

Photo © Randy Korb.

American Bullfrog

Bullfrog with green frog.

Photo © Randy Korb.

American Bullfrog

Bullfrog with green frog.

Photo © Randy Korb.

American Bullfrog

Bullfrog with green frog.

Photo © Randy Korb.

American Bullfrog

Bullfrog tadpole

Photo by Rich Staffen, WDNR.

American Bullfrog

Bullfrog eggs

Photo © A.B. Sheldon.

American Bullfrog

Bullfrog.

Photo by Drew Feldkirchner, WDNR.

American Bullfrog

Bullfrog.

Photo by Drew Feldkirchner, WDNR.

American Bullfrog

Bullfrog.

Photo by Rori Paloski, WDNR.

American Bullfrog

Bullfrog

Photo © A.B. Sheldon.

American Bullfrog

Photo by  staff, WDNR.

American Bullfrog

Photo © Mike Mossman.

American Bullfrog

Photo © A.B. Sheldon.

American Bullfrog

Photo © A.B. Sheldon.


Last revised: Monday, August 13, 2018