Morphometric sex determination of Great Grey Owls Strix nebulosa

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Abstract

Suggestions have been made for sexing Great Grey Owls Strix nebulosa using body measurements as criterion. Here we present measurement data from a long-term collection of 83 dead owls from western and northern Finland indicating that lengths of forearm, and claws 1, 2 and 4, are superior over traditional measurements of wing, tarsus, bill and body mass in determining sex of Great Grey Owls. Forearm of males ranged 123-148 mm, and was on average 138 mm (n = 31). In comparison, the forearm of females ranged 131-162 mm, with an average of 147 mm (n = 49). Based on a logistic regression analysis, the combination of forearm, second claw and wing length was the best predictor in correct sex determination of 95% of the Great Grey Owl specimens.

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Tornberg, R., Mikkola, H., & Rytkönen, S. (2016). Morphometric sex determination of Great Grey Owls Strix nebulosa. Ornis Norvegica, 39, 6–10. https://doi.org/10.15845/on.v39i0.991

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