Describe the process of reproduction and development of a bird.

Reproduction of birds. Males develop paired testes, while females develop eggs in the left ovary and oviduct. And after fertilization, the females lay the egg (s).
Bird development. Chicks need warmth of about 38 degrees Celsius, so females or males sit out clutches with eggs at the time of hatching.
There are two types of nesting or brood development.
For example, chickens have brood development of chicks. From childhood they can follow in the footsteps of their parents and they are born with open eyes and down.
But sparrows have nesting development. Babies appear blind and naked, and their parents watch them and feed them with the caught food.