Any and all. It is a way of lightening the body for flight.
Seagulls do...for sure!
Pigeons do not defecate on the wing, but must be landed to defecate. Their legs grip the base of the tail during flight to increase streamlining, and means they cant defecate on the wing as other birds do, such as seagulls.
falcons and accipiters.
Birds don't know what a car is, they just need to defecate. Also, they often defecate as they fly so their poop falls just anywhere.
Of course they do.
Eagles, Hawks and falcons are known to catch birds in flight and kill them.
59%
Bats have the ability to echolocate, using sound waves to navigate and locate prey in the dark, which birds do not have. Additionally, bats are the only mammals capable of sustained flight, whereas birds have feathers and wings designed for flight.
birds
Um... yes! Every living thing can
Birds defecate anywhere they happen to be when they need to do that -- they go into the porch for other reasons such as to get shade, shelter from rain, protection from predators like hawks or to nest.
Christina Aguilera (Birds of prey)