¿Qué es un ave?

Birds are vertebrate animals similar to reptiles, fish, and amphibians, but they are warm-blooded, maintaining a constant body temperature. Birds are designed for flight with wings, strong chest muscles, and light, hollow bones. They are unique in having feathers, which aid in flight and insulation. Birds reproduce by laying eggs, with young developing inside before hatching.

What role do feathers play in a bird's ability to fly?

Explain the process of how young birds develop before hatching.