An official website of the United States government

The .gov means it’s official.
Federal government websites always use a .gov or .mil domain. Before sharing sensitive information online, make sure you’re on a .gov or .mil site by inspecting your browser’s address (or “location”) bar.

This site is also protected by an SSL (Secure Sockets Layer) certificate that’s been signed by the U.S. government. The https:// means all transmitted data is encrypted  — in other words, any information or browsing history that you provide is transmitted securely.

You are here


Back to top
American bullfrog
Scientific Name:

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

Common Name:

American Bullfrog

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



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

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.