They aren't.
Doves and pigeons. Other birds must scoop water into their beaks and tilt back, but doves can suck water through their beaks like a person uses a straw.
They drink it with their beaks by dipping their head in a puddle, pond, lake,bird bath, ext...
A doves average flight speed is close to 45 mph!
The drinking bird uses a liquid, typically water, to evaporate from its head. When the bird dips its beak into water, the liquid fills its head, causing it to become heavier. As the water evaporates from the felt covering on its head, the decrease in weight allows the bird to tip forward and drink again, creating a continuous cycle of motion. This process is driven by the principles of thermodynamics and the evaporation of the water.
The Bird on My Head was created in 1958.
a Rook is a bird with a black head.
A Bird in the Head was created on 1946-02-28.
The cast of Head on Backwards - 2005 includes: Barry Laird as Boom Operator Alton Milne as Man
To Kill A Talking Bird
Bird Head Son was created in 2008-03.
Yes you can!
Manipulate my balls.