1. Mammals

2. They have four limbs.

3. Mammals They are covered with fur or hair.

4. Mammals They breathe with their lungs.

5. Mammals They give birth to live young. They are viviparous.

6. Mammals Whales and dolphins are also mammals.

7. Birds

8. They have two legs.

9. Vertebrates: Birds They have two wings.

10. Vertebrates: Birds They have a beak.

11. Birds They are covered with feathers.

12. Birds They breathe with their lungs.

13. Birds They lay eggs on land. They are oviparous.

14. Complete about mammals They have four limbs. They are covered with hair. They breathe with their lungs. They give birth to live young.They are viviparous.

15. Complete about birds They have two legs. They have two wings. They have a beak. They are covered with feathers. They breathe with their lungs. They lay eggs on land.