A Bewick’s wren flew down onto the path in front of me. It then proceeded to flutter its wings, kicking up a small cloud of dust. It reminded me of a little windup toy. As it flitted its wings, its body vibrated forward. It would then stop, as if to wind up its motor, and then began again. Within a few minutes, it had exuberantly covered itself with dirt.
Here’s a little excerpt from the essay Bathing and Dusting in the Birder’s Handbook:
“When birds bathe in water or saturate themselves with dust they are actively maintaining their plumage. In well-watered areas bathing is most common, in arid ones dusting is more often observed. Experiments with quail show that frequent dusting helps to maintain an optimum amount of oil on the feathers. Excess plumage lipids, including preen oil, are absorbed by the dust and expelled along with dry skin and other debris. If quail are prevented from dusting, their feathers quickly become oily and matted. Dusting may also help to discourage bird lice, but no experimental evidence exists as yet showing that to be the case.
Wrens and House Sparrows frequently follow a water bath with a dust bath (one reason to suspect an antiparasite function for dusting). Overall, the amount of time and effort birds put into bathing and dusting indicates how critical feather maintenance may be. Feathers are marvelous and intricate devices, but keeping them functional requires constant care.”
Resource
Ehrlich, Paul R., et al. The Birder’s Handbook: A Field Guide to the Natural History of North American Birds: Including All Species That Regularly Breed North of Mexico. Simon & Schuster, 1988.
