The value of birds in nature.

Every type of bird has its own purpose. For instance:
Poultry provide food for humans. Chickens give chicken eggs, goose can be used to bake a grand dinner, etc.
Ordinary birds can give us their beautiful song, and they also fight against insect pests. It is also worth not forgetting that birds carry seeds of different plants, thanks to which we get carbon dioxide. Some species pollinate plants, thereby benefiting agriculture and people in general.