Bullfrog - Frogs and Toads of Florida University of Florida. IFAS. Florida Wildlife Extension.
Identification/Description; Photographs; Illustrations; Impacts; Life Cycle; Habitat; Distribution; Controls; Legal Aspects; Special Note: Call of the Rana catesbeiana (.wav and .aiff files)
Rana catesbeiana University of Michigan. Museum of Zoology. Animal Diversity Web.
Taxonomy; Identification/Description; Photographs; Introduction History; Impacts; Life Cycle; Habitat
North American Bullfrog - Introduced Species Summary Project Columbia University. Center for Environmental Research and Conservation. Taxonomy; Identification/Description; Photographs; Introduction History; Impacts; Life Cycle; Habitat; Controls
Rana catesbeiana -- Bullfrog University of Texas - Austin. Texas Memorial Museum.
Identification/Description; Photographs; Habitat; Distribution