[A stork-billed kingfisher lands on a branch. It’s raining. It shakes its head, then turns around on the branch. It begins preening its wing feathers—run-ing its bill from the base of each feather to the tip. It repeats this several times, then shakes its body, repositioning the feathers. It preens its tail, then gives its body another shake before continuing to preen its tail. It scratches its head with its foot.] [Explore MacaulayLibrary.org]End of transcript
In order to fly at peak performance, birds must carefully maintain their feathers. This means removing dirt, excess oil, and parasites. Birds do this by running their bill from the base of a feather to the tip, a process known as preening. In addition to removing debris, preening also realigns feathers, improving their aerodynamic performance.