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Related to Rana catesbiana: Rana sylvatica, Rana clamitans


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 It might be outdated or ideologically biased.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 ?
a) The International Development Bank is partially financing a program to cultivate seven exotic species in Panama, the scallop Argopecten purpuratus, the "cachamas" Colossoma macropomus and Piaractus brachipomus, the channel catfish Ictalurus punctatus, the peacock bass cichlid Cichla ocellaris, the giant prawn Macrobrachium rosenbergii, and even the bullfrog Rana catesbiana (http://www.iadb.org/EXR/doc 98/apr/lepanaq.htm).
I formally observed this lack of diversity in May 2002, seeing only shoals of bluegill (Lepomis macrochirus), and large populations of larval and adult bullfrogs (Rana catesbiana).
We induced ovulation of each female by injecting 0.5 mL Ringer's solution containing two pulverized pituitary bodies of Rana catesbiana into her abdominal cavity 10 hr before her eggs were used.