Lizards :: essays research papers

LizardsLizards belong to the mannikin Reptilian, Scientists cast said that Reptiles have been on earth for about cc million years. Lizards make up the largest group of reptiles with much than 4,300 species around the orbit varying in different shapes and sizes. Lizards look very similar to salamanders moreover they differ from each other in many ways such as their dry scaly skin and have clawed feet and foreign ear opening. The majority of lizard are quite small have 4 legs and have a fragile tail that can straighten out when part of it is taken off. Lizards are cold-blooded or ectoderms, which means that they search on extractions outside their bodies like the sun, to raise and maintain there form temperatures. Eating habits vary for lizards and depend upon the species. Some lizards apply only on dirt balls such as the Iguana. On the other hand some corrode rodents that roam deserts and eat eggs and small rodents and some feed on both rodents and insects. For protection many lizards use their teeth to fright predators off. Lizards are found in tropical and subtropical regions within the world. hardly a(prenominal) species of lizards are found in temperate regions and none are fixed in arctic areas. Some lizards are terrestrial, arboreal, or semi-aquatic.Very a couple of(prenominal) lizards are poisonous and use their venom as a defense. some(prenominal) other species of lizards dont have a good defending strategy and rely on camouflage such as the chameleon that is able to change its color according to its surroundings. Females of most lizard species vex eggs then are usually left to hatch on their own. How ever an insignificant amount give birth to living girlish such as the slowworm. Some female reptiles, mostly green iguanas, do not need a male of their species to begin their reproductive cycle while others do need the presence of one or more males, and need to stimulate the hormone and other changes that lead to egg ichor and laying. To confuse matters more, some female reptiles, especially chelonians, can retain sperm for many years before finally laying a fertilized egg. well-nigh lizards are harmless and benefit humans by keeping the insect populations stable and halt over population. Some species are a source of food some are killed for their skins, but is not illegal in many countries. A vast number of lizards are threatened by violations on their habitat.