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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.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/
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 It might be outdated or ideologically biased.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 ?
1--Peak power density thresholds resulting in immobilization of tadpoles of American bullfrog, Lithobates catesbeianus (AB), and Southern leopard frog, Lithobates sphenocephalus (SLF), standardized to 100 [micro]S/cm ambient water conductivity using 4 pulse frequencies (15, 30, 60 and 120 Hz).
We examined pond amphibian community structure at breeding sites across the state of Missouri and examined whether the presence of American Bullfrogs, Lithobates catesbeianus, and fish influenced these patterns of diversity.
(In press) Chytrid fungus in Woodhouse's toads, plains leopard frogs, and American bullfrogs along the Platte River, Nebraska, USA.
The North American bullfrog as a reservoir for the spread of Batrachochytrium dendrobatidis in Brazil.
They are the Rana catesbeiana (American bullfrog), and the Rana pipiens.
Ranaviral disease in frogs causes mortality rates of nearly 100% in Bufo marinus (cane toad) tadpoles and 40% in Lithobates catesbeianus (North American bullfrog) metamorphs (Daszak et al., 1999; Green et al., 2002).
Tiffany Garcia, an associate professor of wildlife ecology at Oregon State, will talk about the invasion of the American bullfrog and its effects on Oregon's freshwater systems during the Aug.
Observations of interspecific amplexus between western North American ranid frogs and the introduced American bullfrog (Rana catesbeiana) and a hypothesis concerning breeding interference.
But the North American bullfrog? Well, that is alarming andsomething must be done to stop them.
A mass die-off of wild North American bullfrog (Rana catesbeiana) larvae was discovered in a 1,000-[m.sup.2] pond in western Japan.

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