Animal (amphibian) - American Bullfrog, frog - postcard c.1970s

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Text from the free encyclopedia WIKIPEDIA may appear below to give a little background information (internal links may not  work) :

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The American bullfrog (Lithobates catesbeianus), often simply known as the bullfrog in Canada and the United States, is an amphibious frog, a member of the family Ranidae, or "true frogs". This frog has an olive green back and sides blotched with brownish markings and a whitish belly spotted with yellow or grey. The upper lip is often bright green and males have yellow throats. It typically inhabits large, permanent water bodies, such as swamps, ponds, and lakes, where it is usually found along the water's edge. It can also sometimes be found inhabiting urban areas near ditches and culverts. The male bullfrog defends a territory during the breeding season. His call is reminiscent of the roar of a bull, which gives the frog its common name. This frog is native to southern and eastern parts of the United States and Canada, but has been widely introduced across other parts of North, Central and South America, Western Europe, and parts of Asia, and in some areas is regarded as a pest and an invasive species.

The bullfrog is harvested for use as food in North America and in several other countries into which it has been introduced. It is also cultured in controlled environments, though this is a difficult and not always successful undertaking. Some international trade in frog legs occurs for human consumption. Bullfrogs are often used in biology classes in schools for dissection and are sometimes kept as pets.

The bullfrog is native to eastern North America. Its natural range extends from the Atlantic Coast to as far west as Oklahoma and Kansas. It is not found on offshore islands near Cape Cod and is largely absent from Florida, Colorado, Nebraska, South Dakota, and Minnesota.[13] It has been introduced into Nantucket island, Arizona, Utah, other parts of Colorado and Nebraska, Nevada, California, Oregon, Washington, and Hawaii. In these states, it is considered to be an invasive species and concern exists that it may outcompete native species of amphibians and upset the ecological balance.[13] It is very common in California, where it is believed to pose a threat to the California red-legged frog, and is considered to be a factor in the decline of that vulnerable species.[14]

Other countries into which the bullfrog has been introduced include Mexico, the western half of Canada, Cuba, Jamaica, Italy, the Netherlands, and France.[15] It is also found in Argentina, Brazil, Uruguay, Venezuela, Colombia, China, South Korea[16] and Japan.[17] The reasons for introducing the bullfrog to these countries have included their intentional release, either to provide a source of food or as biological control agents, the escape of frogs from breeding establishments, and the escape or release of frogs kept as pets.[15] Conservationists are concerned the bullfrog is relatively immune to the fungal infection chytridiomycosis and as it invades new territories, it may assist the spread of this lethal disease to more susceptible native species of frog.[18][17]