Red Hawk

What does the red-tailed hawk's four foot wingspan allow it to do?

What does the red-tailed hawk's four foot wingspan allow it to do?
what does it allow the hawk to do "sucessfully"?
it's something specific to the LENGTH of the wing span...i need to know this so please no more stupid answers like "allowing it to fly"

It can ride thermals and fly effortlessly for hours without consuming all it's energy. Sometimes food doesn't come regular, so it needs to conserve energy. I saw a documentary where one ran down a rabbit through the brush and everything. There was a fox trying also. The hawk beat the fox and the fox stayed away. The hawk used it's wings to stabilize during sharp turns. I don't think they have a four foot wingspan though. There are a pair that ride the thermals on my hill. They cannot outmaneuver crows, but when they get high enough, they make a straight flight and go out of sight in an instant.

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