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Freezing North American Wood Frogs
These frogs freeze completely when winter comes, entering a hibernation period. They actually stop their heartbeat, and thaw when spring comes..
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 Order: Anura, Family: Bufonidae The American toad is located in the Midwestern to eastern region of North America. They range east of the Rocky Mountains to the Atlantic Coast, and from mid-Canada to Mexico.
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 Order: Anura, Family: Ranidae Palearctic: Rana temporaria is a common terrestrial frog in Great Britain, Europe and northwestern Asia. In continental Europe they are referred to as "grass frog" or "brown frog". They are resistant to cold climates and live as far north as the Arctic circle in Scandinavia, farther north than any other amphibian in the region.
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 Order: Caudata, Family: Ambystomatidae The tiger salamander is named for its striped pattern.
It is the world's largest land-dwelling salamander.
The tiger salamander ranges from 6 to 13 inches long and is stout with a broad head and rounded snout. It has small, rounded eyes, and its feet have tubercles.
It is brownish-olive in color with black and yellow spots or blotches. Its underside is usually yellow.
The male tig...
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 by Rex Dalton, San Diego A disturbing trend of population declines and birth deformities in amphibians has prompted a US federal agency to launch an ambitious research programme.
The national Amphibian Research and Monitoring Initiative (ARMI) has been set up by the US Department of the Interior with $5 million to study why frogs, salamanders and toads are in such trouble. An additional $2 million is being sought for ...
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 Order: Scaphiopus, Family: Pelobatidae The spadefoot toad is a relatively moist, smooth-skinned amphibian.
It has a horny, broad black "spade" on its webbed hind feet, which it uses for burrowing.
Approximately 11/2 to 3 inches long, the spadefoot has large, bulgy eyes with vertical pupils. It is usually olive to brown in color with a pair of yellow stripes that extend from the eyes down the middle of the back.
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 Order: Anura, Family: Ranidae The golden mantella measures about 1 inch long and is a brilliant golden-orange color. It occasionally has red flash marks on the insides of its hind legs, and its eyes are jet-black.
It has short legs and distinct adhesive disks on its fingers and toes.
The sexes are dimorphic, with males generally smaller, slimmer and more angular in build than females.
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