What is the importance of pneumatic bones and air sacs in birds?

Explanation

### Step-by-Step Solution:

1. **Understanding the Structures**:
- Pneumatic bones and air sacs are specialized adaptations found in birds (class Aves).
- Pneumatic bones are bones that are hollow and filled with air, while air sacs are extensions of the lungs that help in respiration.

2. **Characteristics of Birds**:
- Birds are bipedal, feathered, warm-blooded animals capable of maintaining a constant body temperature (homeothermy).
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