Mammals

Mammals are a class of vertebrates that are characterized primarily by mothers feed their babies through breast.

This is because when dealing with complex animals, they need to spend more time depending on the mother after birth. That is born immature.

HIGHLIGHTS OF MAMMALS

1. They are warm-blooded, or what is the same, its temperature is constant.

2. Mothers are provided with mammary glands that supply milk to their young.

3. The mouth is surrounded by lips to suckle their young.

4. They have abundant glands (sebaceous, sweat and odor) and generally abundant peloque move periodically.

5. They have teeth to chew food.

6. They have pulmonary respiration.

7. Most are viviparous: the embryo develops inside the mother and expense asus feeds through the placenta.

Mammals can live on land, fly, or live in the water.

They have four limbs, typically completed in five fingers provided corneas nails, claws, hooves or less atrophied, excepting those in the sea-cetaceans like whales and dolphins .But often the number of digits is less than five.

Your resiración is plumonar catch oxygen in the air but live in water.

PLAYBACK is sexual and most of them are viviparous, ie develop inside the mother's body, which is responsible for feeding and removing substances excretion embryo.

To perform these functions the mother has two bodies: the placenta and uterus.

However there are no placental mammals, as in marsupials (kangaroo, koala) because the marsupial pouch replaces the placenta.