Question

why birds are not available in near by areas ? give reasons​

Answer 1

I think they migrate, from one place to another

Answer 2

Birds are not available in nearby areas nowadays because of deforestation. It is the major cause in decrease in number of birds around us as their primary place to build their nests is trees and they are cut down for building towers,bridges, dams, etc.

Secondly the weather conditions are changing every year which makes hard for birds to survive or migrate.