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  • All fields: BOWDOIN NATIONAL WILDLIFE REFUGE
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    • Eugene Kridler oral history transcript

    • History; Biography; Employees (USFWS); Surveying; Tagging; Endangered species; Birds; Management; Biologists (USFWS)
    • Eugene Kridler oral history interview as conducted by Jerry C. Grover.
    • 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...
    • 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...
    • Marsh hawk

    • Birds; Birds of prey;
    • A marsh hawk, also known also as a hen harrier, uses an upright log for a perch.

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