Mammals



 Mammals  are a clade of warm-blooded  animals distinguished from reptiles and birds by the possession of hair (with a few exceptions, all cetaceans), three middle ear bones, mammary glands, and a neocortex (a region of the brain). The mammalian brain regulates body temperature and the circulatory system, including the four-chambered heart. The mammals include the largest animals on the planet, such as whales, as well as some of the most intelligent, such as elephants, some primates and some cetaceans. The basic body type is a four-legged land-borne animal, but some mammals are adapted for life at sea, in the air, in the trees, or on two legs. The largest group of mammals, the placentals, have a placenta which feeds the offspring during pregnancy. Mammals range in size from the 30–40 mm bumblebee bat to the 33-meter blue whale.

 All female mammals nurse their young with milk, which is secreted from special glands, the mammary glands. Except for the five species of monotremes (egg-laying mammals), all modern mammals give birth to live young. Most mammals, including the six most species-rich orders, belong to the placental group. The three largest orders, in descending order, are rodents, bats and shrews/moles. The next three largest orders, depending on the classification scheme used, are the primates, to which the human species belongs, the Cetartiodactyla (including the even-toed hoofed mammals and the whales), and the Carnivora (cats, dogs, weasels, bears, seals, and their relatives).

Many of the Union Species such as Togar, Holdian, Human, Alakarr, Nogoll and others are classified as mammals.