Phil Savoie / Cliff swallow (Petrochelidon pyrrhonota) carrying nesting material over the Madison River, Yellowstone National Park, Montana, USA. July.
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Phil Savoie / Cliff swallow (Petrochelidon pyrrhonota) carrying nesting material over the Madison River, Yellowstone National Park, Montana, USA. July.
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Phil Savoie / Cliff swallow (Petrochelidon pyrrhonota) carrying nesting material, a feather, to the Gallatin River, Montana, USA, July.
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Phil Savoie / Cliff swallow (Petrochelidon pyrrhonota) in flight carrying nesting material, Nez Perce Creek, Yellowstone National Park, Montana, USA, July.
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Phil Savoie / Cliff swallow (Petrochelidon pyrrhonota) nesting colony, Yellowstone National Park, Montana, USA, May.
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Phil Savoie / Cliff swallow (Petrochelidon pyrrhonota) gathering mud for nest building, Yellowstone National Park, Montana, USA.
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Marie Read / Cliff Swallow (Petrochelidon pyrrhonota) adult in flight, Bear River Migratory Bird Refuge, Utah, USA, May.
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Gerrit Vyn / Great Horned Owl (Bubo virginianus) adult female roosting in a cliff covered in Cliff Swallow nests (Petrochelidon pyrrhonata) Sublette County, Wyoming, USA, June
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Gerrit Vyn / Cliff swallow (Petrochelidon pyrrhonota) at nest. Sublette County, Wyoming, USA. June.
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Gerrit Vyn / Cliff swallow (Petrochelidon pyrrhonota) at nest. Sublette County, Wyoming, USA. June.
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Charlie Summers / Cliff Swallow (Petrochelidon pyrrhonota) Aurora Parkway, Aurora, Colorado, USA. May.
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Charlie Summers / Cliff Swallow (Petrochelidon pyrrhonota) banking in flight. Aurora, Colorado, USA. May.
