Identification and Status of Wood Pewees (Contopus) from the Great Plains: What Are Sibling Species?

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Abstract
Discriminant functions analysis was used to identify specimens of wood pewees (Contopus) from the Great Plains. Size and shape differences between C. virens and C. sordidulus are slight, but significant differences in multivariate space were found. Specimens from places where both species occur are not phenetically intermediate; no evidence of hybridization was found. Singing birds were morphologically like those of the species whose song they sang; no evidence of song switching was found. Analyses show that C. virens occurs in summer as far west as Crockett County Texas [USA], Morton County, Kansas [USA] and Phillips County, Montana [USA]. C. sordidulus occurs in summer east to Phillips County, Montana; it is a fairly common and regular migrant through extreme western Kansas.

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