鳄鱼是迄今发现活着的最早和最原始的动物之一。它是在三叠纪至白垩纪的中生代（约两亿年前）由两栖类进化而来，延续至今仍是半水生且性情凶猛脊椎类爬行动物，它和恐龙是同时代的动物，属肉食性动物。属脊椎类两栖爬行动物，其性情大都凶猛暴戾，喜食鱼类和蛙类等小动物，甚至噬杀人畜。 这种古老爬行动物...
crocodile found so far is one of the earliest and the most primitive living animal. It is in the Triassic to Cretaceous of Mesozoic Era (about two hundred million years ago) evolved by amphibian, continuity is still semi aquatic and ferocious temperament spine reptiles and dinosaurs, it is the same time animal, is carnivorous animal. Genus of vertebrate amphibians and reptiles, the most violent temperament fierce, eating fish and frogs and other small animal, or even bite kill livestock. This ancient reptiles...
