A Fly can't bird, but a bird can fly.
There is an ecstatic mechanism in birds that makes them fly upwards in spite of worms.
You put his brain in a bird, the bird would fly backwards" -Secret Life of the Bees
The respiratory mechanisms of birds are definitely adapted to the function of flight, as evidenced by the fact that birds which do not fly (Apteryx, Penguins) show these adaptations in a greatly reduced form.
Tie two birds together. They will not be able to fly, even though they now have four wings.
As you know, birds do not have sexual organs because they would interfere with flight.
Owl explained about the Necessary Dorsal Muscles. He had explained this to Pooh and Christopher Robin once before and had been waiting for a chance to do it again, because it is a thing you can easily explain twice before anybody knows what you are talking about.
The bird that flutters least is longest on the wing.
Birds evolved from a small raptor like theropod.
Fly flight is just a great phenomenon to study. It has everything - from the most sophisticated sensory biology; really, really interesting physics; really interesting muscle physiology; really interesting neural computations.
