Circus hudsonius
Length: 15-20 in Wingspan: 40-50 in Weight: 1-2 lbs
Identification:
Long-tailed hawk with owl-like facial disk and white rump patch in flight. Male gray overall. Female streaked brown and buff.
Distribution:
Range map by Neotropical Birds
Cool Facts:
Northern Harriers use sight and sound to hunt, unlike most raptors that rely on keen eyesight alone. Similar to owls (the masters of hunting by sound), harriers have a disk-shaped face that helps direct sound to their ears.
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References:
Bird on the Move 