While flying, birds push the air downwards with their wings. Give reasons.
In birds, flapping of wings provides both ___ and ___ in their air.
Birds can fly because they have(a) a streamlined body(b) hollow bones(c) wings with feathers(d) all of these
Why do the birds flap their wings downward, while taking a flight?
Give reasons for the following:
Birds flying high in the sky do not cast their shadows.