How are birds useful to humans? please tell the answer its inmportant?

hmmm lets see.
-food source
-seed dispersal
-some clean up dead animals reducing disease vectors
-many prey on rodents and insects which also reduces disease vectors.
-if the proper technology isn't available, they can be used to detect high levels of toxins in the air
-they produce a fitting wardrobe for corrupt politicians that can be applied with a bit of tar.
Many of them, ducks, geese, doves, quail, grouse, partridge are good to eat.

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