Birds have got 2 legs, 2 wings and a ____. They are warm-blooded. They lay ____. Most birds can ____, but some can't. Penguins can swim very well, but they can't fly. ____ live part of their life on land and the other part in water. They have got ____ skin. They haven't got ____ or fur. They normally live in places with ____. Reptiles have got ____. They are ____. They are ____ animals. Most reptiles have got ____. Fish live in ____. They have got ____ to breathe under water. They have got ____ and scales. Mammals have got ____ or fur. They are warm-blooded. Their babies drink ____ from their mothers. Most mammals live on ____. Some mammals live in water, like dolphins and ____.

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