Dave Bevan / Pair of Sand martins (Riparia riparia) feeding chicks, Carmarthenshire, Wales, UK, July.
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Donald M. Jones / American Cliff Swallow (Petrochelidon pyrrhonota) gathering mud for nest building, Montana
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Donald M. Jones / American Cliff Swallow (Petrochelidon pyrrhonota) trio gathering mud for nest building, Montana
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Dave Bevan / Sand martin (Riparia riparia) flying to nest hole and feeding chick, Carmarthenshire, Wales, UK, June.
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Matthew Studebaker/ BIA / American Cliff Swallow (Petrochelidon pyrrhonota) collecting mud for nest, Wyoming
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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 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.
