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鳄鱼鳄鱼是鳄目所有爬行类动物的统称。通常为体形巨大、笨重的爬行动物，外表上和蜥蜴稍类似，但是比它稍微大一些，属肉食性动物。目前公认鳄的品种共23种。 The crocodile is alligator eye all reptiles collectively. Usually for bodily form is huge, and the heavy reptiles, appearance and lizards slightly similar, but a slightly greater than it some, belong to carnivores. Currently accepted alligator were 23 varieties.鳄是现存生物中与史前时代似恐龙的爬虫类动物相联结的最後纽带。同时，鳄又是鸟类现存的最近亲缘种。大量的各种鳄化石已被发现；4个亚目中有3个已经绝灭。根据这些广泛的化石纪录，有可能建立起鳄和其他脊椎动物间明确关系。 It is a living organism and prehistoric times like the dinosaur reptiles in the last link connection. At the same time, it is related to the existing recently of birds. A large number of all sorts of alligator fossil has been found; Four mysticetes 3 a have gone extinct. According to these extensive fossil record, may establish crocodile and the clear relationship between other vertebrates.鳄鱼是迄今发现活着的最早和最原始的爬行动物，它是在三叠纪至白垩纪的中生代（约两亿年以前）由两栖类进化而来，延续至今仍是半水生性凶猛的爬行动物，它和恐龙是同时代的动物，恐龙的灭绝不管是环境的影响，还是自身的原因，都已是化石；鳄鱼的存在证明了它生命的强有力。The crocodile is ever found alive first and most primitive reptiles, it is in the Triassic period to cretaceous period of the Mesozoic era (about two hundred million years ago) evolved by amphibians, continue today is still a half water a fierce reptiles, it and dinosaurs were contemporary animals, extinction of the dinosaurs whether environment influence, or their own reasons, are already is a fossil; The crocodile exists to prove it life of powerful.鳄鱼不是鱼，属脊椎动物爬行虫纲，是恐龙现存唯一的后代。它入水能游，登陆能爬，体胖力大，被称为“爬虫类之王”。它以肺呼吸，由于体内氨基酸 链的结构，使之供氧储氧能力较强，因而具有长寿的特征。一般鳄鱼平均寿命高达150岁. Crocodiles are not a fish, belong to crawl worm webs, vertebrates is the only existing generations. Dinosaur It into the water can swim, the landing can climb, the body fat force big, known as the "king" of reptiles. It pulmonary breath, as the chains of amino acids, the structure of the oxygen supply oxygen storage capacity is strong, thus has the characteristics of longevity. General average life is as high as 150 years old crocodile.鳄鱼最大体长达12米重约10吨，但大部分种类鳄鱼平均体长约6米重约1吨，主要以鱼类、水禽、野兔、蛙等为食，属肉食性动物。颚强而有力，长有许多锥形齿，腿短，有爪，趾间有蹼。尾长且厚重，皮厚带有鳞甲。The most general for up to 12 m crocodile heavy about 10 tons, but most of the species at an average of about six meters crocodile weighs about a ton of, mainly with fish, birds, the hare, frog, for food, predatory animals. Of Jaw strong and powerful, and there are many conical teeth long, short legs, a claw, four-toed webbed between toes. The tail is long and thick, with thick skin scales鳄鱼属脊椎类爬行动物，分布于热带到亚热带的河川、湖泊、海岸中。鳄鱼科属很多，现存的