1. Adaptation to flight. The contour pen makes the body shape streamlined. Fly feathers form a wing. Steering feathers form on the tail.
2. Participate in thermoregulation (due to the high heat-shielding properties of feathers and air spaces between them). Fluff protects from the cold.
3. Protects a bird from various mechanical influences
4. Feathers give birds a particular color, which is often patronizing
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