Many species of passerines are sexually monochromatic and thus sex cannot be determined based on plumage characteristics. Northern Waterthrushes (Parkesia noveboracensis) and Swainson’s Thrushes (Catharus ustulatus) are two such species. The objective of this study is to examine morphological differences between males and females of both species and determine whether this information may be used to determine sex. With genetically sexed birds, I indicate wing chord values can be used to determine sex with 95% confidence. This information would allow field researchers to determine sex of 58% of Northern Waterthrushes and 33% of Swainson’s Thrushes with 95% confidence of correct assignment. If age is taken into account, the proportion of individuals for which sex can be determined increases to 62% and 38%, respectively. This information may be used by avian ecologists in future studies of behavioral ecology, conservation biology, or evolutionary biology these species.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.