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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.
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


(mining engineering)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


any of various large frogs, such as Rana catesbeiana (American bullfrog), having a loud deep croak
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
I investigated larval competition rather than predation by adult bullfrogs (Moyle 1973) because adults did not exhibit the same degree of habitat and resource overlap as larvae.
Coic was quoted as having warned that, 'if we do nothing, the bullfrogs will overrun France within a century'.
BFAR is currently training the catfish farmers to create a net barricade enough to prevent the bullfrogs from jumping into the fish farms.
Caption: AN ALLIGATOR named Clem survived in a desert environment for nearly two decades on a diet of bullfrogs and the occasional grocery store chicken.
The main product obtained from bullfrogs is the thigh cut, and in this study frogs with less than 100 grams had the highest yield, but animals with this weight range have small thighs, which can be a limiting factor on the consumer market.
Bullfrogs have a complex life cycle that consists of two distinct phases with different dietary habits: the tadpole stage is omnivorous (SCHIESARI et al., 2009), whereas adult frogs after metamorphosis have a carnivorous diet (SECOR, 2009).
The binary dummy variable was used to calculate diversity at three taxonomic levels: (1) 'Total', for all amphibian taxa excluding American Bullfrogs; (2) 'Salamanders', for all seven caudate taxa; (3) 'Frogs', for 12 anuran taxa excluding American Bullfrogs.
In the feeding of bullfrogs, the whole performance is based on the quantity and quality of the protein in the diet.
I do not know what has happened to bullfrogs in our country, or crayfish for that matter, except it seems they are both pretty much gone.
Camels, eagle owls, African bullfrogs and a royal python all got the same treatment at the Regent's Park zoo's annual weigh-in.