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Accipiter cooperii
As in many birds of prey, the male is smaller than the female. The birds found east of the Mississippi River tend to be larger on average than the birds found to the West. The eyes of this hawk, as in most predatory birds, face forward, enabling good depth perception for hunting and catching prey while flying at top speeds. They have hooked bills that are well adapted for tearing flesh of prey. They also hunt songbirds at backyard feeders, perching nearby then swooping down and scattering the birds to single one out in flight. They may pursue prey on the ground by half running and half flying. They have been known to rob nests and may supplement their diet with small mammals such as chipmunks, hares, mice, squirrels, and bats.
Seen in my backyard one evening, through a screened window.
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