- Many kinds of animals live around us. Some live in forests and others live in and around our houses.
- Some animals are bigger than us and some others are smaller. Many differences are seen in the structure of eyes, ears, nose, tail etc.
We can describe the animals based on the structure of their organs.
We can identify the animals by looking at the parts of their body.
- Some animals have ears, but not visible.
- Like we have ears, all animals also have ears.Though some others have ears,we cannot see them.
- You know very well that ears help us to hear.Bird's ears are not visible externally.
- A bird has tiny holes on both sides of its head.
- Generally, the holes are covered with feathers. They help the bird to hear.
- we will see tiny holes on a lizard's head. These are its ears.
- A crocodile also has ears like this,but we cannot see them easily.
- Snake has no ears.Its skin perform the function of ears.Snake recognises the sounds by its skin.
- Skin protects all the organs of the body. It gives a shape to the creature.
- We can recognise the animals by the colour and patteren of hair present on their skin.
- The animals whose ears are seen and have hair on the skin, give birth to 'babies'.
- The animals whose ears are not seen and have no hair on the skin, lay 'eggs'.
- The animals which lay eggs, incubate and bring up the babies are called "oviparous".
- The animals which give birth to babies are called 'viviparous' (or mammals).
- The hair and skin of animals protect them from cold and heat. Hair and skin are useful to the human beings too. We also use the hair of animals.
- The skin of animals is also useful to us. Animal skin is used to make foot-wear, musical instruments like drums etc. Animals give us food also. They are also used in agriculture and transporting goods.