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  • All fields: Philadelphia
(131 results)



Display: 20

    • Bullfrog

    • Amphibians; Wildlife refuges;
    • Bullfrog at John Heinz National Wildlife Refuge, Philadelphia, PA.
    • Wyoming toads and cattle: at home on the range

    • Aquatic animals; Biologists (USFWS); Extinctions; Endangered species; Amphibians;
    • Biologists feared that the Wyoming toad was extinct until 1987 when a fisherman discovered a population at Mortenson Lake on Swanson’s land. The discovery created excitement about a chance to save the species and its habitat, and it led Swanson...
    • Aily Zirkle oral history transcript

    • Biography; Birds; Employees (USFWS); Biological control; Education; Environmental quality; Environmental education; Winter sports; Wildlife viewing; Wildlife refuges; Villages; Migratory birds; Surveying; Migration;
    • Aily Zirkle oral history interview as conducted via radio interview.
    • Great Horned Owl

    • Birds of prey; Wildlife refuges;
    • Great horned owl at John Heinz National Wildlife Refuge, Philadelphia, PA.
    • Osprey

    • Birds of prey; Wildlife refuges;
    • Close-up of Osprey at John Heniz National Wildlife Refuge, Philadelphia, PA.
    • Bald Eagle

    • Birds of prey; Wildlife refuges;
    • Bald eagle at John Heinz National Wildlife Refuge, Philadelphia, PA.
    • Bald Eagle with Fish

    • Birds of prey; Wildlife refuges;
    • Bald eagle with fish in its talons at John Heinz National Wildlife Refuge, Philadelphia, PA.
    • Red-Tailed Hawk

    • Birds of prey; Wildlife refuges;
    • Red-tailed hawk at John Heinz National Wildlife Refuge, Philadelphia, PA.
    • Immature Bald Eagle

    • Birds of prey; Wildlife refuges;
    • Immature bald eagle at John Heinz National Wildlife Refuge, Philadelphia, PA.
    • Bonaparte's gull

    • Birds; Aquatic birds; Aquatic environments; Shorebirds;
    • A Bonaparte's gull in flight along Lake Erie.
    • Bonaparte's gull

    • Birds; Aquatic birds; Aquatic environments; Shorebirds;
    • A Bonaparte's gull is pictured swimming along Lake Erie.
    • Bonaparte's gull

    • Birds; Aquatic birds; Aquatic environments; Shorebirds;
    • A Bonaparte's gull is seen swimming across Lake Erie.
    • Two Bald Eagles with Chicks

    • Birds; Birds of prey; Wildlife refuges;
    • Two bald eagles with chicks at John Heinz National Wildlife Refuge, Philadelphia, PA.
    • Bald Eagle

    • Birds; Birds of prey; Wildlife refuges;
    • Bald eagle with young at John Heinz National Wildlife Refuge, Philadelphia, PA.
    • Students Birdwatching

    • Birds; Environmental education; Youth; Wildlife refuges;
    • Philadelphia school students take part in an educational birdwalk at Tinicum marsh, John Heinz National Wildlife Refuge, PA.
    • Students Birdwatching

    • Birds; Environmental education; Youth; Wildlife refuges;
    • Philadelphia school students take part in an educational birdwalk on Tinicum marsh at John Heinz National Wildlife Refuge, PA.
    • 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...

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