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Mid-summer arrival by Blue Grosbeaks at the northern extent of their breeding range: evidence for dual breeding?

David L. Swanson, Auteur ; Reza Goljani Amirkhiz, Auteur

Dans Journal of Field Ornithology (92(2) June, 2021)

Anecdotal observations of mid-summer arrival of Blue Grosbeaks (Passerina caerulea) in South Dakota, in the northern portion of their breeding range, suggest that this species may show a pattern of arrival at the northern breeding grounds that d[...]

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