Division and Classification Essay (Reptiles)

1363 Words Jan 3rd, 2012 6 Pages
Division and Classification Essay Animals that breath air and have scales on the exterior of their body are referred to as reptiles. Reptiles have been dated back to have been on the earth for the past 315 million years, though not all species are extant in modern times. All reptiles are ectotherm, which means they are “cold-blooded” animals (whereas most mammals are warm-blooded). All reptiles are also tetrapods, which mean they have four limbs (or they have descended from four-limbed ancestors). In general most reptiles are oviparous (egg-laying), with the exception of some viper and constrictor snakes that give live birth. In regards to size, reptiles can be anywhere from a tiny 0.6 inch gecko all the way up to a 20 foot crocodile …show more content…
They have very good night vision and are also able to see under water well (though they tend to rely on other senses more when submerged). Depending on the size of the animal within the domain, Crocodilians eat a wide variety of things. Smaller animals within the domain eat anything from insects to other small reptiles, whereas larger apex predators such as the Alligator and the Crocodile can eat small animals all the way up to deer, zebra, and even humans if provoked and given the opportunity. Crocodilians replace their teeth on a constant basis throughout their life. Their teeth grow within each other so when one breaks there will be a fully grown one waiting inside. Crocodilians teeth development slows as they age. There have been witness accounts of some old crocodilians being toothless due to their age and the fact that teeth production has by that time slowed to a complete stand still. Crocodilians have been known to go through three-thousand teeth in their entire life (Wikipedia, Crocodilia). The order Sphenodonita is the smallest out of the four orders. There is only one living genius containing two species of the Tuatara (Sphenodon). The Sphenodontia order dates all the way back to the Mesozoic era more than one-hundred million years ago. It is only found in the country of New Zealand and the people of New Zealand (the Maori) believe them to be scared creatures.

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