Insectivorous birds fly in circles to catch flying insects.
What do you mean whats the difference.... birds that can fly, FLY and birds that can't fly, CAN'T. birds that fly is positive birds that can't fly is negative.
Type your answer here... why do crows fly circles in air
It is not only birds that fly. Bats fly and they are not birds.
A bird flies. If it was not semetrical, it would fly crooked. If birds flew crooked, there would be a bunch of birds flying around in circles. Sponges do not fly or even move, so they do not need to be semetrical.
its penguins they are birds they have wings but they do not fly :)
Birds can fly. Problem in the question?
no all birds do not fly
Dragonflies fly in circles when they are part of a swarm. When dragonflies are in a swarm they are looking for housing or food.
not all birds can fly
Not all birds can fly.
Most birds can fly. Not all.