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         Birds

Birds are a group of animals called vertebrates, or animals with backbones. They form the class Aves.

They are warm-blooded and lay eggs. Their bodies are covered with feathers and they have wings. Their bones are hollow. This makes them lighter and allows many of them to fly. Birds have two legs usually covered with scales (small, flat hard plates which over-lap in the same way as feathers).
They have a hard beak with no teeth. Because birds keep a high body temperature, they use lots of energy. So, they need to eat a lot of food compared with their weight. More than 9000 different species of birds are known.

Birds are found on every continent of the world. Birds of different types can live in freezing cold environments, and others can live in hot deserts. Birds live in forests, in grasslands, on cliff faces, in river banks, on stony sea shores, down mine shafts and in the rooves of houses.

*The purpose is to describe things as they are.

*Using Simple Present Tense

*Generic structure:

 1. General Clasification

 2. Descriptions