MAMMALS

MAMMALS

What are mammals like?

-They are the most complex vertebrates.

-They are present in all environments.

THE MAIN CHARACTERISTICS

-Most of them have hair on their bodies.

-This hair maintains a good body temperature.

-They are endothermics.

-Females have well-developed mammary glands that produce milk to feed their babies.

-They have lips, they use to suckle and they have different types of teeth for cutting...

-They have 4 limbs, their shape depends on their type of locomotion: walking, swimming...

-They use lungs to breathe. even the aquatic mammals.

-They have a highly-developed nervous system.

NUTRITION

-They can be carnivores, hervivores or omnivores.

-Their dentition varies between species according to the type of food they eat.

REPRODUCTION

-Their reproduction is sexual.

-The majority are viviparous.

-In the viviparous mammals the baby develop inside the mother and obtain the nutrients they need from her blood.

THE MAIN TYPES OF MAMMALS

There are 3 main groups: monotremes, marsupials

and placentals.

MONOTREMES

-They lay eggs with shell.

-They have webbed feet, a bill or beak

and a flat tail.

-Therir mammal glands don't have teats

theri baby feed by licking the milk of suckling.

MARSUPIALS

-They are viviparous, they give birth to their baby

at a early stage of development

-The baby continue their development in the pouch.

PLACENTALS

-The babies are connected to the

mother by a organ called the

placenta and they are

born fully developed.