in female mammals during the feeding calves milk appears.It stands out from special glands, which are called: milk.For newborn mammals is a natural food, but each species has its own characteristics it.For example, in the domestic cat milk protein compounds is about 10 times more than cow milk.In zoology has a special unit that deals with the study is a mammal.It theriology.Since people also nurse their babies milk, then they belong to this class of living creatures.In addition to feeding, person has other features that are typical for the entire class of mlekopitayuschih.Vazhnoy feature that is particularly strong in people is the development of the forebrain, and cerebellum.In most species of this class brain is wired is difficult, has many convolutions and folds, and mor
e of them, and the more complex they are organized, the more variety may be the animal's behavior.Development of peripheral nervous system of mammals allows quickly respond to external stimuli.They are also characterized by binocular vision, that is, the picture in the brain is generated based on images of both eyes, as opposed to, for example, birds that are seen by both eyes otdelnosti.Takie features as breathing through the lungs and heart availability quad are common tomammals.Most of them have a scalp required to maintain a constant body temperature.This warm-blooded species, and their average body temperature for the class is about 30 degrees.Exceptions are the whales and hippos, as well as the human species, whose members are protecting themselves with warm clothing.Mammals - an amazing class, his views are very diverse.Some of them are flying, others live on the earth's surface, there are also many who spend most of their lives underground.They are not too similar to each other.Total is now among the mammals, there are 20 units of existing animals, even a little more than 10 units are extinct.Hominids, which include humans, this order of mammals primates.In addition to modern man well, Homo sapiens, Neanderthals are a hominid, Pithecanthropus and some fossil humans, such as Australopithecus.