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Amphibian

Amphibians (class Amphibia) are a taxon of animals that include all tetrapods (four-legged vertebrates) that do not have amniotic eggs. Amphibians (from Greek αμφις "both" and βιος "life") generally spend part of their time on land, but they do not have the adaptations to an entirely terrestrial existence found in most other modern tetrapods (amniotes). more...

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There are about 5,700 living species of amphibians. The study of amphibians and reptiles is known as herpetology. The fear of amphibians and reptiles is known as herpetophobia.

History of amphibians

Amphibians developed with the characteristics of pharyngeal slits/gills, a dorsal nerve cord, a notochord, and a post-anal tail at different stages of their life. They have persisted since the dawn of tetrapods 390 million years ago in the Devonian period, when they were the first four-legged animals to develop lungs. During the following Carboniferous period they also developed the ability to walk on land to avoid aquatic competition and predation while allowing them to travel from water source to water source. As a group they maintained the status of the dominant animal for nearly 75 million years. Throughout their history they have ranged in size from the 3 foot long Devonian Ichthyostega, to the slightly larger 5 foot long Permian Eryops, and down to the tiny Brachycephalus didactylus (Brazilian Gold Frog) and Eleutherodactylus iberia from Cuba, with a total length of 9.6-9.8 millimeters. Amphibians have mastered almost every climate on earth from the hottest deserts to the frozen arctic, and have adapted to climatic change with ease.

  • Solomon Berg Martin, Biology
  • Duellman/Trueb, Biology of Amphibians

Read more at Wikipedia.org


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00004000
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Smith & Wesson Men's Amphibian Commando Sww-1100Smith & Wesson Men's Amphibian Commando Sww-1100 $17.99 Russian Vostok Auto Amphibian Kgb Watch #710457bs NewRussian Vostok Auto Amphibian Kgb Watch #710457bs New $69.90
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		Russian SubMarine Vostok Amphibian Diver Watch 200M water resistant Glow HandsNew listing Russian SubMarine Vostok Amphibian Diver Watch 200M water resistant Glow Hands $39.95 Vintage Vostok Komandirskie Amphibian Military Watch Air Naval Force #475Vintage Vostok Komandirskie Amphibian Military Watch Air Naval Force #475 $49.00
New Russian Vostok Amphibian Divers Automatic Wristwatch Keeping TimeNew Russian Vostok Amphibian Divers Automatic Wristwatch Keeping Time $90.00 Russian Watch Vostok Wostok "Commander" Submarine . Waterproof . Amphibian .Russian Watch Vostok Wostok "Commander" Submarine . Waterproof . Amphibian . $25.00
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		Smith & Wesson Amphibian Commando WatchNew listing Smith & Wesson Amphibian Commando Watch $49.61 Serviced~Rodania Swiss~Amphibian~5 Atm Jeweled Quartz~All Stainless Steel WatchServiced~Rodania Swiss~Amphibian~5 Atm Jeweled Quartz~All Stainless Steel Watch $99.99
Russian Vostok Auto Amphibian Military Watch #15344 New !Russian Vostok Auto Amphibian Military Watch #15344 New ! $69.00 New listing
		Vostok Amphibian Watch Rare AutomaticNew listing Vostok Amphibian Watch Rare Automatic $100.00 00004000
Soviet Military Vostok Amphibian Diver men's diver's watch shockproof MintSoviet Military Vostok Amphibian Diver men's diver's watch shockproof Mint $66.60 Was: Previous Price $74.00 New Vostok Amphibian Komandirskie Custom Steel Bezel PolishedBrushed CombinationNew Vostok Amphibian Komandirskie Custom Steel Bezel PolishedBrushed Combination $19.95
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Prices current as of last update, 04/24/17 11:47am.

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