Sociable weaver bathing
Bathing birds
Together, bathing and preening form the regular grooming routines of birds around the world.
Birds have evolved to keep themselves clean and their plumage well maintained, developing a range of well-practiced techniques to rid their feathers of the dust, dirt and damage caused by daily life. Dirt-free feathers are vital to all aspects of a bird�s life, including regulating their temperatures, being able to fly and keeping parasite-free.
After bathing, many birds follow a series of ritualistic steps to expel any moisture, shaking their tail, vibrating their wings and fluffing out their feathers.
Interesting link:
birdfact.com