property: a special quality of something.species: a group of animals that are more like each other than they are like any other group of animals.classification: a systematic arrangement in groups.are covered with scales or smooth, leathery skin.have three pairs of legs originating from the thorax.have a single pair of antennae on the head.have three body parts: head, thorax and abdomen.have four legs without claws or nails on toes.breathe with lungs, gills, and/or their skin.lay eggs, usually in a jelly-like mass in water.have no legs or four legs with clawed toes.lay eggs with leathery shells or give birth to fully-formed young.have two wings used for flying (ostriches and penguins are flightless).have four limbs with digits ending in claws, nails, or hooves (except whales).have hair on at least part of their body.give birth to their young and feed them with milk.The following is a list of properties for each group of animals. A way of sorting through all those species is to organize them by similar properties, or characteristics. They can breed with each other but not with members of other species. A species is a group of animals that are more like each other than they are like any other group of animals.
There are at least five million species on Earth, and some scientists believe there could be double that number.
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