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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 ?
3--Peak voltage gradient thresholds resulting in immobilization of American bullfrog, Lithobates catesbeianus (AB) and Southern leopard frog, Lithobates sphenocephalus (SLF), in ambient water conductivity ([micro]S/cm) using 4 pulse frequencies (15, 30, 60, and 120 Hz) for tadpoles and two (30 and 60 Hz) for frogs.
American Bullfrog effects are positive and larger for frogs than salamanders, fish effects are negative and larger for salamanders than frogs.
We report the causative agent, Batrachochytrium dendrobatidis, in North American bullfrogs (Rana catesbeiana) farmed for the international restaurant trade.
Udder-like clusters of inflated pink rubber gloves and loud intermittent croaking -- perhaps emitted by some of the American bullfrogs currently invading France -- evoke the presence of teeming nature in a bucolic pond setting where flattened patches of straw among reeds suggest recent amorous activities [Le nid des deesses Mappa by Duthoit & Barbier of Hemisphere, France].
But Mr Langton said there were now six strong leads on its origin, including the possibility of that it has come via goldfish imported from the US which may carry a virus found in American bullfrogs.
Frog virus 3 infection, cultured American bullfrogs.
American bullfrogs have also been introduced to other parts of the world, such as Latin America, the Caribbean and Southeast Asia.
SCIENTISTS have discovered that American bullfrogs could provide a cure for MRSA.
ILLEGAL FROGS: Destructive North American bullfrogs may still be being illegally imported into Britain, experts have warned.
Now at Cornell University's Laboratory of Ornithology in Ithaca, Purgue had been studying the acoustics of North American bullfrogs.
WILDLIFE experts who discovered the first breeding colony of giant American bullfrogs in Britain last year are trying to find out if there are any more out there.
Our family raises American Bullfrogs (Raba catesbeiana) at Rana Ranch in Idaho.

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