2. The Animal Kingdom
Animals are broadly divided into vertebrates and invertebrates.
Animals
Vertebrates Invertebrates

3. Vertebrates and Invertebrates
Vertebrates are animals with backbones.
Invertebrates are animals without backbones.

4. Classification of Vertebrates
Vertebrates are divided into five groups
Vertebrates
Mammals Birds Reptiles Fish Amphibians

5. Fish Fish are cold-blooded. They breathe through their gills.
They have fins and tails.
Their bodies are streamlined.
Their skin is covered with hard scales.
Most fish reproduce by laying eggs.

6. Mammals Warm-blooded vertebrates are called mammals.
Mammals have hair and fur and their young are fed on milk.

7. Amphibians
Amphibians are cold-blooded vertebrates which can live both on land and in water.
Most amphibians spend their adult lives on land and return to the water to lay eggs.
They usually have loose and moist skin.

8. Reptiles Reptiles are cold-blooded animals. They have dry, scaly skin.
They reproduce by laying eggs on land.

9. Birds Birds are vertebrates that lay eggs with shells.
They are warm-blooded.
They are the only animals with feathers.
They have beaks and wings but not all birds can fly.

10. Classification of Invertebrates
Invertebrates Vertebrates with Vertebrates jointed legs without jointed legs

11. Invertebrates with jointed legs

12. Invertebrates without jointed legs

13. Review Remember, the animal kingdom is divided into two groups:
Vertebrates and Invertebrates.
Vertebrates are further divided into five sub-groups: Fish, Mammals, Reptiles, Amphibians, and Birds.
Invertebrates are divided into those with jointed legs and those without jointed legs.

14. Exercise
Choose the vertebrates which are mammals.

15. END OF LESSON