How does an owl fly quietly?
In many owl species, wing and feather structures reduce flight noise and help approach prey at night.
Anatomy, feeding and habitat
Comb-like projections on the leading edge break large air vortices into smaller structures. Velvety feather surfaces and soft trailing edges can reduce high-frequency sound. Broad wings generate lift at low speed, allowing fewer forceful beats. Quietness varies with species, hunting style and feather condition. A bird's bill, feet, wings and feathers offer clues to feeding and movement, although one structure can serve several functions. Flight depends on muscles, body proportions and weather as well as wing size. Season, age and molt may change appearance.
Behavior, reproduction and conservation
The facial disc directs sound toward the ears, and asymmetric ear openings in some species help locate sound vertically. Owls are not completely silent and also use vision. Wet or worn feathers can increase noise, while traffic and human sound can interfere with acoustic hunting. Breeding timing relates to food and climate, and nest success from one year is not generalized. Light pollution, glass collisions, habitat loss and invasive species affect birds differently. Conservation includes feeding, resting and migration sites as well as nests.