Why are the birds called feathered-bipeds?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Term "Feathered":**
- Birds are referred to as "feathered" because their bodies are fully covered with feathers.
- Feathers serve as an external covering that provides insulation, waterproofing, and aids in flight.

2. **Understanding the Term "Bipeds":**
- The term "biped" refers to organisms that move using two legs.
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