Not many people did seen an otter. These animals live near rivers and make their homes from small pieces of wood. They usually come out of their homes at night. Otters are very good in the water and can swim at more than 10 kilometers ____3____ hour. They have thick brown hair and this ____4____ them warm in the water. An otter can close ____5____ ears and nose. This means otters can stay under water ____6____ several minutes.Twenty years ago, there were ____7____ otters in Great Britain. The water in the rivers was so dirty that many fish and insects died and the otters couldn’t find anything to eat. But today there is lots of food for them ____8____ the rivers are clean again.
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