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Sagot :
Over 200 million years ago, during the Mesozoic era, mammals first appeared. Mammals (from Latin mamma "breast") are a group of vertebrate animals that make up the class Mammalia.
mammalia are distinguished by the presence of three middle ear bones, a neocortex (a region of the brain), fur or hair, and mammary glands, which in females produce milk for feeding (nursing) their young. These traits set them apart from other reptiles, such as birds, from which they split off in the Carboniferous period, more than 300 million years ago. There are 29 orders and 6,400 known species of mammals that are alive today. The rodents, bats, and eulipotyphla are the three orders with the most species (hedgehogs, moles, shrews, and others). The following three are the Artiodactyla (cetaceans and even-toed ungulates), the Carnivora (cats, dogs, seals, and others), and the Primates (including humans, apes, monkeys, and others).
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