Other Names: none
Distribution: northern deciduous forests worldwide; may be found further south in east Asia.
Size: 49-64 cm in length with a 93-127 cm wingspan. Makes weigh 500-1200 g, while females weigh 800-2220 g.
Plumage: Adults are blue-gray above with a black crown, and the undersides are off-white finely barred with gray. Juveniles are similar, but generally brown above and streaked below. The beak is black with a gray base and the legs and eyes are yellow.