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common name of the largest North American frog, Rana catesbeiana. Native to the E United States, this species has been successfully introduced in the West and in other parts of the world. The body length is 4 to 8 in. (10–20 cm), and the legs may be up to 10 in. (25 cm) long. An aquatic form with fully webbed toes, the bullfrog can close its nostrils and lie at the bottom of a pond for some time. Males have a loud, booming call. Bullfrog tadpoles require two or three years to become adults. The bullfrog is the only frog whose legs are marketed in quantity for food in the United States. Several other large frogs of the genus Rana are called bullfrogs in other regions. Bullfrogs are classified in the phylum ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
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, subphylum Vertebrata, class Amphibia, order Anura, family Ranidae.



(Rana catesbiana), one of the largest representatives of the genus Rana of the family Ranidae. Length, up to 20 cm; weight, up to 600 g. The back is olive brown with indistinct dark brown spots.

The bullfrog is widely distributed in North America, where it lives in thickets along rivers. It feeds on invertebrates, small fish, frogs, and small mammals; it preys on the nestlings of domesticated ducks. The males make a bellowing noise that sounds like a bull (hence the name). The tadpoles develop for two years. Bullfrogs have commercial value as food and are bred on farms. They have been introduced into some South American countries and Japan.


(mining engineering)


any of various large frogs, such as Rana catesbeiana (American bullfrog), having a loud deep croak
References in periodicals archive ?
Raul Millana, chief of fisheries support at BFAR XI, said that the program was specifically designed to be non-lethal for the bullfrogs as they were part of the ecosystem's food chain.
To determine whether American Bullfrogs, fish, or their interaction predicted total amphibian species diversity, salamander species diversity, or frog species diversity in Missouri, we fitted generalized linear mixed-effect regression (GLMER) models with a binomial error term in the package 'lme4' (Bates et aL, 2014).
There are also drawbacks to raising bullfrogs as farm animals.
75%) in the bullfrog tadpoles examined, this study shows that invasive bullfrogs, a known reservoir of chytridiomycosis, are also a likely carrier of ranaviral disease in Europe.
The exposed eardrums, or tympanums, are very large in bullfrogs.
Such great leaps exceed the calculated power of bullfrog muscles, Astley says.
And bullfrogs can grow double the size of a green frog.
State officials are proposing to stop the water flows into Piru Creek, a popular fishing spot between Los Angeles and Ventura counties, to help save the native, federally endangered southwestern arroyo toad from the invasive and prolific bullfrog.
We previously observed almost complete sexual differentiation of the gonads in both sexes in bullfrogs by Gosner stage 35 (13,16).
Thirty bullfrogs were collected from late July to early August of 2000.
More than 7,000 bullfrogs, mainly tadpoles and froglets, have been removed from the site.
Here I present observations that where bullfrogs are well established in otherwise unaltered river habitats, breeding populations of the native ranid are much lower than populations upstream of the invasion front.