Avian Osteology

Femur
40 mm


Sharp-shinned Hawk 38 - 53 mm	American Kestrel 32 - 40 mm	Merlin 39 - 50 mm	Western Screech-Owl 37 - 47 mm


Eastern Screech-Owl 36 - 44 mm	Burrowing Owl 34 - 42 mm	Boreal Owl 33 - 43 mm