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.
It is not only birds that fly. Bats fly and they are not birds.
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
not all birds can fly
Not all birds can fly.
Most birds can fly. Not all.
Not sure what you mean by that, but birds do fly.
yes umbrella birds do fly
To say that birds use wings and feathers to fly, so all birds can fly, would be false. Not all birds can fly. An ostrich is an example of a bird that cannot fly.
All birds that are light and have feathers and have a purpose to fly