In birds

Which of the following birds helps in pollination? (A) Sun birds (B) Humming birds (C) Bats (D) Both (A) and (B)

Why the small birds like humming birds are not · found in Polar Regions?

Which among the following birds impersonates the calls of other birds to steal food?

The white substance in the bird’s faeces is-

Which birds is called sweeper bird? Why?