Owl

Asymmetric ears

Barn owls have one ear opening higher than the other, hidden under their feathers. The vertical asymmetry lets them locate prey in pitch darkness using sound alone — the disparity between when a sound reaches each ear gives both horizontal and vertical position. Experiments have shown they can catch a mouse in total darkness on the first attempt.

Silent flight

Barn owls fly almost soundlessly. The leading edge of each primary flight feather is fringed with comb-like serrations that break up turbulence; the trailing edges have a soft fringe; and a velvety pile on the upper surface of the wing absorbs the rest of the sound. The result is wing noise so quiet that the prey hears nothing until impact — and the owl’s own hearing isn’t drowned out by its flight.

Heart-shaped face

The disc of stiff feathers around a barn owl’s face isn’t decoration — it acts as a parabolic reflector, funneling sounds to the asymmetric ear openings. Disturbing the disc with too-tight feather damage can degrade the owl’s hunting accuracy.

Pellets

What an owl can’t digest — bones, fur, teeth, claws — is compacted in the gizzard and regurgitated as a tightly packed pellet, typically once or twice a day. Dissecting pellets is a classic schoolroom exercise; the bones inside reveal exactly which species the owl ate.

Working farms

A breeding pair of barn owls and their chicks can consume over 1,000 rodents in a single nesting season, making them effective allies for farmers. Some agricultural regions actively install nest boxes to encourage them as biological pest control.