Cooper's hawks are smallish "bird hawks" (slightly smaller than American Crows) with rounded wings, a long rounded tail, and long yellow legs.
This is the mid-sized accipiter nesting in Oregon and is larger than the Sharp-shinned hawk, but smaller than the Northern goshawk.
The usual mode of flight consists of several rapid wing-beats alternating with brief periods of sailing. Juveniles are dark above with underparts streaked vertically while adults tend to have a bluish cast to their gray upperparts. The long tail is barred dark and light with narrow whitish band at the tip.
It is an uncommon breeder in forests and woods through the state except in arid treeless areas of southeastern Oregon. It is also an uncommon transient and winter visitor statewide.