____ have got fur or hair. ____ have got thick skin and scales. People are ____. Some ____ have got a shell. Frogs are ____. All ____ have got fins and a tail. ____ drink their mother's milk. Most ____ have got scales and teeth. ____ can live on land and in water. ____ have got a beak and feathers. Most ____ lay eggs in water.

Tiger 3. Unit 2. Animal groups

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