Rough-legged Hawk Hunting Technique

Like some other buteos, depending on conditions the Rough-legged Hawk may hunt from the air using flapping/gliding flight or from an elevated perch but their tendency to hunt in flight goes up significantly with increasing wind speed. This makes sense because hovering in the wind requires less energy than flapping flight.

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The Alula (bastard wing) Of A Kestrel In Flight

Many extinct and ancient relatives of modern birds had alulae, as do flies (insects of order diptera). I find it fascinating that evolutionary selection pressure has produced this structure in such diverse and relatively unrelated groups as birds and some flying insects. And that man has (once again) copied nature to solve a modern problem.

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