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  • All fields: Calcarius
(7 results)



Display: 20

    • Lapland longspur

    • Birds; Perching birds; Wildlife refuges;
    • A close-up view of a Lapland Longspur at the Kodiak National Wildlife Refuge in Alaska.
    • Lapland Longspur

    • Birds; Songbirds; Alaska; longspurs; Amchitka; Aleutian Islands; Alaska Maritime NWR; Donna Dewhurst Collection
    • Photo was taken on Amchitka Island.
    • Molt and aging critera for four North American grassland passerines

    • Birds; Grasslands; Migratory birds; Perching birds; Research; Species of concern;
    • This is a description of the molt and aging criteria for four grassland passerines. The species covered are Sprague's Pipit, Grasshopper sparrow, Baird's sparrows, and Chestnut-collared Longspurs. Molt information is important for determining...
    • A guide to nestling development and aging in altricial passerines

    • Birds; Perching birds; Research; Statistics;
    • This is a guide to altricial passerines. It has an explanation of variables used for aging birds and an explanation of methodology employed, and provides information obtained while recording the early aging of the Dusky Flycatcher, the Carolina...
    • Birds of conservation concern 2008

    • Birds; Migratory birds; Species of concern;
    • This is a report that identifies migratory and non-migratory birds species that represent the highest conservation priorities to the U.S. Fish and Wildlife Service.

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