Question

we se that birds swallow their food they donot chew it so how they digest their food.

Answer 1

They have a special part in their digestive tract that is gizzard
Guzzard is muscular oragan having circular muscles it have hard structure in its inner lining called teeth or proventricular which masticate the food.
Thanks

Answer 2

hey mate☺,

Gizzard organ is responsible for it .

I hope it will help you✌✌