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Amphibians (class Amphibia), such as frogs, toads, salamanders, newts, and caecilians, are ectothermic (or cold-blooded) animals that metamorphose from a juvenile water-breathing form, to an adult air-breathing form. Though amphibians typically have four limbs, the Caecilians are notable for being limbless. Unlike other land vertebrates (amniotes), amphibians lay eggs in water. Amphibians are superficially similar to reptiles. Amphibians are ecological indicators, and in recent decades there has been a dramatic decline in amphibian populations around the globe. Many species are now threatened or extinct. Amphibians evolved in the Devonian Period and were top predators in the Carboniferous and Permian Periods, but many lineages were wiped out during the Permian-Triassic extinction. One group, the metoposaurs, remained important predators during the Triassic, but as the world became drier during the Early Jurassic they died out, leaving a handful of relict temnospondyls like Koolasuchus and the modern orders of Lissamphibia. From Wikipedia under the
GNU Free Documentation License  news.nationalgeographic.com 299px x 461px | 52.60kB [source page] PHOTOS Over 200 New Amphibians Found in Madagascar From Yahoo Image Search: "Amphibians"  treehugger.com unknown ue, 01 Dec 2009 16:45:34 GM Image credit: kuribo/Flickr It seems obvious that . amphibians. , with their permeable skin and proclivity for aquatic environments, would be among the first to be effected by chemical pollution and environmental degradation.  leopardgeckosale.blogspot.com Magic ue, 22 Dec 2009 01:47:00 GM Not many people know that frogs and toads common garden come to the special category called . amphibians. . They are called . amphibians. because they can live both on land and in water. They have a special set of lungs, respiratory support, ...  herper.com Chad Arment Wed, 16 Dec 2009 00:13:00 GM USARK suspects that animal rights activists who are pushing for the ban on pythons may have set up a recent large python capture (and photo-op) in Tampa. (News source.) From Google Blog Search: "Amphibians"  news.google.com Lindsay Daily Post Because of its seasonal flooding, it becomes a haven for breeding amphibians . In early April the wetland is filled with a loud chorus of frogs and toads. ... news.google.com Hilton Head Island Packet The first episode will feature reptiles and amphibians . The series is hosted by author and naturalist Tony Mills of the LowCountry Institute and will focus ... news.google.com AboutMyArea When they are young the crocodiles live on small invertebrates found in and around the water as well as small fish and amphibians . ... and more » From Google News Search: "Amphibians" What reptiles and amphibians are in upper michigan? Q. i want to know what reptiles and amphibians are near or around mackinaw city, charlevoix and traverse city. please say specifically where they are located. Asked by Evani - Fri Jul 17 18:20:28 2009 - - 1 Answers - 0 Comments A. Check these: Book: Amphibians and reptiles of the Great Lakes Region JSTOR Journal: Amphibians and Reptiles of the Douglas Lake Region in Northern Michigan Answered by Believer - Tue Jul 21 10:00:31 2009 Why are amphibians born underwater while reptiles are born out of water? Q. I understand the differences that enable amphibians and reptiles to be born in their respective environments, but what caused this difference between the two groups to occur? Asked by W - Thu Sep 20 01:33:43 2007 - - 2 Answers - 0 Comments A. For the purpose of reproduction most amphibians are bound to fresh water. A few tolerate brackish water, but there are no true seawater amphibians. Several hundred frog species in adaptive radiations (e.g., Eleutherodactylus, the Pacific Platymantines, the Australo-Papuan microhylids, and many other tropical frogs), however, do not need any water whatsoever. They reproduce via direct development, an ecological and evolutionary adaptation that has allowed them to be completely independent from free-standing water. Almost all of these frogs live in wet tropical rainforests and their eggs hatch directly into miniature versions of the adult, passing through the tadpole stage within the egg. Several species have also adapted to arid and semi-ari [cont.] Answered by Rhonnie - Thu Sep 20 01:52:46 2007 Which animals first lived on land during the dinosaur age? Was it fish, amphibians or reptiles?
Q. The factors and changes in the body structure of the animal when changing to a new environment. Asked by indrajit - Sun Jul 12 04:07:03 2009 - - 7 Answers - 0 Comments A. < Answered by KTDykes - Sun Jul 12 04:29:49 2009 From Yahoo Answer Search: "Amphibians"
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