Page 15 - Science class 4

A bat feeding A woman bathing A mare feeding A bitch feeding
its young one her baby its colt its puppies

These animals are the most highly developed among all animals. Their body is
covered with hair.

These animals carry the young ones within their bodies till they are fully developed

to be born.

Mammals take good care of their young ones. They feed them, clean them
and keep them safe until they have learnt to look after themselves.

Some examples of mammals are cats, horse, goats, elephants, rabbits and
rats.

Bat is the only mammal that can fly. It also gives birth to young ones. It does
not make a nest and lives in old buildings or caves. The mother bat feeds and
takes care of the baby bats.

Animals that Lay Eggsthat Lay Eggsthat Lay Eggs
Animals
Animals
Some animals that lay eggs are fish, insects
and birds. Some young ones, that come out
after hatching look like the parent animals.

Some look very different at birth. But as
Egg shell
they grow, they look like their parents.
Albumen
Birds
Yolk
Birds build nests only when they want to lay
A bird in
eggs. A nest keeps the eggs and the baby the nest Air sac
birds safe. Structure of a bird's egg

A bird's egg has a hard, outer shell to protect the chick growing inside. The

mother keeps the egg warm by sitting on it.

This is called incubation . The embryo or the growing chick lies in the
yellow part of the egg called yolk . The embryo feeds on the yolk as it
grows. The jelly white like part is called albumen . It protects the embryo.