Amphibians

Animal which live both on land and water are called amphibians. Frogs, toads and salamander are some of the amphibians. Baby frogs are known as tadpoles. They grow in water and have gills for breathing. Adult frogs have gills to breathe on land. They also breathe through their skin when in water. Frogs have webbed hind feet to swim in water.

Aquatic animals

Animals that live in water are called aquatic animals. Fishs, crabs, seals and seahorses are some of the example of aquatic animals. Fish have fins to swim with. Dolphins have oar-like flippers to swim in water.
Animals like fish, crabs and prawns which live inside water have gills to breathe oxygen dissolved in water. Some aquatic animals like whales and dolphins breathe through lungs. So, they come to the surface of water very often to breathe air. Water birds like ducks and swans have webbed feet which help them to paddle in water.

Aerial animals

Animals that can fly in the air are called aerial animals. Birds and bats fly in the air. Birds have wings to fly with. They also have hollow bones which make their body light and make them fly.
Bats are not birds. They are mammals. They do not have true wings. Their wings are made of flaps of skin.
Many insects also have wings which help them fly in the air.

Arboreal animal

animals which spent a lot of time on trees are called arboreal animals. Their body is suited to live in trees.
They have long and strong limbs with sharp claws to climb the trees. The monkey and the chameleon have long tails to grip the branches.the tails also help the arboreal animals to balance their body.

Animals in very cold or snowy regions

The snow leopard which lives in the snowy mountains of the Himalayas has a thick white coat of hair in their body. The fur not only protects them from the severe cold, but the white color also makes them less visible against the white background. This helps them to approach their food without being noticed.

Animals like seals, walruses and penguins have a thick layer of fat called blubber which keeps their body warm in the cold freezing conditions.

Most birds survive to winter by going to warmer places. This is called migrations. They return to their original homes when the winter is over.

Frogs, snakes, lizards and many insects survive the winter by going into a long period of rest. They don't eat or drink during this period. They keep lying in a safe place like a cave, hole or burrow to save energy. This period of winter sleep is called hibernation

Desert animal

The camel is the best example of desert adaptation. It has broad, padded feet to walk comfortably on sand. After the camel eats food, the extra food and water changes to fat and gets stored in the camel's hump. Then the camel can go on for days without food and water. Camel's have long, thick eyelashes to keep them safe from sand during sandstorms. they are also able to close their nose during a sandstorm.

To beat the daytime heat, many desert animals such as desert rats come out in search of food only during the night time. Some animals stay inside their holes during the hot summer months without eating any food. This long period of summer sleep is known as aestivation.