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Femur
37 mm





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American Kestrel
32 - 40 mm
  Western Screech-Owl
37 - 47 mm
Eastern Screech-Owl
36 - 44 mm
Burrowing Owl
34 - 42 mm
Boreal Owl
33 - 43 mm
Northern Saw-whet Owl
29 - 37 mm


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