Owls have short legs because they’re excellent at hunting in the dark, and being short allows them to fly faster.
The scientists hypothesize two probable reasons why owls are specially adapted for nighttime hunting: (1) their upright stance soars better into the air than birds of prey that perch on a down-stroke; and (2) their organs for echolocation generate an intense concentration of sound waves from which they can detect potential prey by vibrating sound waves off objects. Called sonar, these delicate sounds are not audible to humans but may enable owls to nab unsuspecting night-flying insects as well as small mammals like rats.
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