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American bullfrog
American bullfrog, adult - Photo by Russ Ottens; University of Georgia
Scientific Name: 

Lithobates catesbeianus (formerly known as Rana catesbeiana) (ITIS)

Common Name: 

American Bullfrog

Native To: 

Central and Eastern U.S. (Clarkson and deVos 1986)

Date of U.S. Introduction: 

First introduced to the Western U.S. in the early 1900s (Clarkson and deVos 1986)

Means of Introduction: 

Most introductions have been associated with escapes from aquaculture operations. Other pathways include bait used for recreational fishing and escapes or releases through the pet trade, landscape ponds, research, and teaching (Adams and Pearl 2007).


Competes with and preys on native species (Ficetola et al. 2007)

Current U.S. Distribution: 
Western U.S.

Distribution / Maps / Survey Status

DOI. USGS. Wetland and Aquatic Research Center.
Provides detailed collection information as well as animated map.


University of Georgia. Center for Invasive Species and Ecosystem Health.


Google. YouTube; Wyoming Game and Fish Department.

Selected Resources

The section below contains highly relevant resources for this species, organized by source. Or, to display all related content view all resources for Bullfrog.

Council or Task Force

Oregon Invasive Species Council.

Washington State Recreation and Conservation Office. Washington Invasive Species Council.

IUCN. Species Survival Commission. Invasive Species Specialist Group.
Great Britain Non-Native Species Secretariat.
Federal Government
DOI. USGS. Wetland and Aquatic Research Center.
Provides distribution maps and collection information (State and County).
International Government
British Columbia Ministry of Environment (Canada).
See also: Amphibians in B.C. for more resources
State and Local Government

California Department of Fish and Wildlife.

Oregon Department of Fish and Wildlife.

University of Michigan. Museum of Zoology.
Columbia University. Center for Environmental Research and Conservation.

University of California. Agriculture and Natural Resources. California Aquatic Invasive Species.