A bird's feathers are what help them fly and stay warm or cool in different climates. Birds are warm-blooded, egg-laying animals that have vertebrae, or a backbone. They are different from mammals.
The bird is a flying feathered creature, with two strong wings and two legs. It can fly in the sky and travel long distances in the air.
Many people spend hours and days watching birds. I imagine it sharpens their senses. Their eyes learn to pick out flashes of movement in the overwhelming green of the canopy.