What are the differences between animals belonging to the Aves group and those in the mammalia group?

Explanation

### Step-by-Step Solution:

1. **Body Covering**:
- **Aves**: The body of Aves (birds) is covered with feathers.
- **Mammalia**: The body of mammals is covered with hair.

2. **Forelimbs**:
- **Aves**: In birds, the forelimbs are modified into wings, which are used for flight.
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