Listed below are the differences:
| Aves | Mammalia |
| Body is covered with feathers | Body is covered with hairs |
| Teeth absent | Teeth present |
| They possess a beak | Beak absent |
| Forelimbs are present and modified to take a flight | Forelimbs are present and used for multiple activities |
| Bones are hollow | Bones are solid |
| Body is streamlined | Streamlining of body is not observed(except whales) |
Explain how animals in Vertebrata are classified into further subgroups.
How are the criteria for deciding divisions in plants different from the criteria for deciding the subgroups among animals?
What are the major divisions in the Plantae? What is the basis of these divisions?
Explain the basis for grouping organisms into five kingdoms.
How would you choose between two characteristics to be used for developing a hierarchy in classification?