- American Bullfrog, Rana catesbeiana
- Covers size, coloration, gender identification, native and introduced locations, map, and photos.
- Bullfrog Rana catesbeiana
- Describes distinguishing features, range and habitats. With pictures, maps and links.
- DesertUSA Bullfrog Rana catesbeiana
- Contains information on physical description, distribution, habitat, calling sound, behavior, breeding and food habits. With pictures and links to related sites.
- Frogs and Toads of Georgia Bullfrog Rana catesbeiana
- Contains information on diagnostic features, natural history, voice, tadpoles and range. With pictures, maps, sounds and links.
- Iowa Herpetology Bullfrog Rana catesbeiana
- Provides information on status, description, subspecies, range, habitat, habits and feeding. With pictures and links.
- Nova Scotia Frogs Bullfrog
- Contains information on habitat, calling, reproduction and diet. With pictures and links.
- Reptiles and Amphibians of Minniesota Bullfrog Rana catesbeiana
- Presents information on status, description, subspecies, range, habitat, habits and feeding. With pictures and links.
- USGS Western Ecological Research Center Bullfrog Rana catesbeiana
- Provides information on size, distinguishing characteristics, juveniles, dimorphism and similar species. With pictures and links.
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