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Mammals with placenta. Mammals without placenta. Different types of mammals.

Mammals are the most highly-developed vertebrates in existence.
In order to adapt themselves to their many different surroundings, mammals have converted themselves into beings which differ from one another.
Differences in their extremities.
Common characteristics: they have warm blood, gestation inside their motherís body and a remarkable development of their perceptive organs.

Monotremata are the most primitive mammals in existence.
Characteristics of the duckbilled platypus.
Marsupials: the kangaroo.
Insect-eating mammals and rodents have placentas.
Rodents live in almost every habitat on Earth. Their characteristics. The capybara.
Bats are the only mammals that can fly. Their main characteristics.

Some mammals became bigger and made their homes in the most diverse ecosystems, whilst specialising their eating-habits.
Herbivorous mammals. Ungulates. Rumiants.
Herbivorous mammals serve as food for carnivorous ones.
Many have eyes situated at the front of their heads, a well-developed sense of smell and an excellent ear.
Marine carnivorous mammals. They have streamlined shapes. Otters and seals.

Group of cetaceans: whales, sperm whales, dolphins and killer whales. They have adapted themselves completely to their marine world.
Their characteristics.
Intelligence of cetaceans.
Intelligence of primates. Simians, orangutans, gorillas. Their characteristics.
The human being has a larger brain than simians and uses two feet to walk.


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