Avian Osteology

Skull
78 mm


Osprey 72 - 85 mm	Swainson's Hawk 67 - 79 mm	Red-tailed Hawk 75 - 87 mm


Rough-legged Hawk 71 - 86 mm	Gyrfalcon 72 - 83 mm	Barn Owl 64 - 81 mm


Spotted Owl 70 - 78 mm	Barred Owl 70 - 82 mm	Great Gray Owl 76 - 90 mm