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Korea Biodiversity Information System > Wildlife Resource > Mammal Classes > Characteristics fo Mammals
They are warm-blooded vertebrate animals with a constant body temperature. They maintain a relatively constant and high temperature in most environments by producing heat inside their bodies.
They have lacteal glands in their skin to feed their young. Their milk is well developed to feed their offspring under any circumstances, even when there is no food.
The entire mammal body is covered with hair, and is divided into four parts: head, neck, body, and tail. Even whales and dolphins, which do not seem to have hair, actually have some hair on closer inspection. Each part of the mammal body has a different size depending on its living environment.
Most mammals are viviparous animals; they give birth to living offspring. After nurturing the embryo in the uterus following internal fertilization, the mother brings forth the offspring through live birth rather than laying eggs.
Some mammals have four legs that are appropriately developed in several directions to walk or run depending on the characteristics of each individual species and environment they live in.
They breathe through their lungs and have a diaphragm between the chest and the abdomen, separating the abdominal and thoracic cavities.
Mammals have a highly developed brain.
Mammals have well-developed upper and lower jaws and can cut and grind food to the proper size with specialized teeth (incisors, canine teeth, premolars and molars).
The mammal hearts are composed of two atria and two ventricles.
