Probable Non-Breeders among Female Blue Grouse

Abstract
Two groups of yearling females were identified from a series of blue grouse [Dendragapus obscurus fuliginosus] examined on Vancouver Island, British Columbia [Canada]. Birds collected during a continuous yearling-only removal had a high proportion of apparent non-breeders when compared to hens that had bred. Early presence on the breeding range did not increase or decrease the chance of joining the breeding population, but the heaviest birds were most likely to become established.

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