Lizards :: essays research papers

LizardsLizards belong to the class Reptilian, Scientists w ar said that Reptiles have been on stiletto heelth for about 200 meg years. Lizards make up the largest group of reptiles with more than 4,300 species around the world change in discordent shapes and sizes. Lizards look very similar to salamanders but they differ from each otherwise in galore(postnominal) ways much(prenominal)(prenominal) as their dry scaly skin and have clawed feet and external ear opening. The majority of lizard be quite small have 4 legs and have a fragile tail that can regenerate when grammatical constituent of it is taken off. Lizards are cold-blooded or ectoderms, which means that they depend on sources outside their bodies like the sun, to raise and maintain there body temperatures. alimentation habits vary for lizards and depend upon the species. Some lizards feed only on insects such as the Iguana. On the other hand some eat rodents that puke deserts and eat bombard and small rodents and some feed on both rodents and insects. For protection legion(predicate) lizards use their teeth to scare predators off. Lizards are found in tropical and subtropical regions within the world. Few species of lizards are found in temperate regions and none are located in arctic areas. Some lizards are terrestrial, arboreal, or semi-aquatic.Very few lizards are poisonous and use their venom as a defense. S invariablyal other species of lizards dont have a good defensive dodging and rely on camouflage such as the chameleon that is fitting to change its color according to its surroundings. Females of most lizard species lay eggs then are usually left to hatch on their own. How ever an insignificant amount give birth to living young such as the slowworm. Some female reptiles, mostly green iguanas, do not hold a male of their species to begin their reproductive cycle dapple others do need the presence of one or more males, and need to stimulate the hormone and other changes that lead to egg maturation and laying. To fudge matters more, some female reptiles, especially chelonians, can retain sperm for many years before finally laying a fertilized egg. Most lizards are harmless and benefit humans by keeping the insect populations permanent and halt over population. Some species are a source of intellectual nourishment 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.