No, they land before sleeping.
no
NO!! If they did, they wouldn't fly!
There is a distinct difference. I believe I can fly, and birds just fly. :) Just kidding. People fly with 200 ton contraptions of metal and fire, while birds fly with 2 limbs of feather, skin, bone, and muscle. See the difference?
It is not only birds that fly. Bats fly and they are not birds.
Fish are aquatic vertebrates that have gills for breathing and fins for swimming, while birds are feathered, warm-blooded, egg-laying vertebrates with wings for flying. Fish live in water, while birds predominantly live on land and in the air.
because of their sharp claws and strong feet
Most birds can fly. Not all.
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.
Nothing, birds fly and feed off of worms, while cattle feed off of roughage and grains.
The birds that can fly because it is easier for them to find food.
all birds fly xept penguins
The Swift spends most of its time on the wing; it rarely ever lands, and when it does it prefers to perch on vertical surfaces. A Swift does everything on the wing, including sleeping. Albatross also sleep while gliding over the sea, opting to sleep while flying than landing on the water where they could be prey for Orca or humans. These birds only ever land for the breeding season.