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    • american cliff swallow
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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.
American Cliff Swallow (Petrochelidon pyrrhonota) flying, Texas
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Alan Murphy / American Cliff Swallow (Petrochelidon pyrrhonota) flying, Texas
Cliff Swallow (Petrochelidon pyrrhonota) Aurora Parkway, Aurora, Colorado, USA. May.
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Charlie Summers / Cliff Swallow (Petrochelidon pyrrhonota) Aurora Parkway, Aurora, Colorado, USA. May.
Cliff Swallow (Petrochelidon pyrrhonota) banking in flight.  Aurora, Colorado, USA. May.
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Charlie Summers / Cliff Swallow (Petrochelidon pyrrhonota) banking in flight. Aurora, Colorado, USA. May.
American Cliff Swallow (Petrochelidon pyrrhonota), California
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Benjamin Knoot / American Cliff Swallow (Petrochelidon pyrrhonota), California
American Cliff Swallow (Petrochelidon pyrrhonota), Alaska
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Jacob S. Spendelow / American Cliff Swallow (Petrochelidon pyrrhonota), Alaska
American Cliff Swallows (Petrochelidon pyrrhonota) flock visiting muddy puddle to gather mud as nesting material. Mono Lake Basin, California, USA, June.
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Marie Read / American Cliff Swallows (Petrochelidon pyrrhonota) flock visiting muddy puddle to gather mud as nesting material. Mono Lake Basin, California, USA, June.
American Cliff Swallows (Petrochelidon pyrrhonota) forced copulation attempt at muddy puddle where they are gathering mud as nesting material. Mono Lake Basin, California, USA, June.
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Marie Read / American Cliff Swallows (Petrochelidon pyrrhonota) forced copulation attempt at muddy puddle where they are gathering mud as nesting material. Mono Lake Basin, California, USA, June.
American Cliff Swallows (Petrochelidon pyrrhonota) forced copulation (attempt at muddy puddle where they are gathering mud as nesting material. Mono Lake Basin, California, USA, June.
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Marie Read / American Cliff Swallows (Petrochelidon pyrrhonota) forced copulation (attempt at muddy puddle where they are gathering mud as nesting material. Mono Lake Basin, California, USA, June.
American Cliff Swallows (Petrochelidon pyrrhonota) forced copulation attempt at muddy puddle where they are gathering mud as nesting material. Mono Lake Basin, California, USA, June.
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Marie Read / American Cliff Swallows (Petrochelidon pyrrhonota) forced copulation attempt at muddy puddle where they are gathering mud as nesting material. Mono Lake Basin, California, USA, June.
American Cliff Swallow (Petrochelidon pyrrhonota) fluttering its wings while it gathers mud in its bill to use as nesting material. Mono Lake Basin, California, USA, June.
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Marie Read / American Cliff Swallow (Petrochelidon pyrrhonota) fluttering its wings while it gathers mud in its bill to use as nesting material. Mono Lake Basin, California, USA, June.
American Cliff Swallow (Petrochelidon pyrrhonota) fluttering its wings while it gathers mud in its bill to use as nesting material. Mono Lake Basin, California, USA, June.
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Marie Read / American Cliff Swallow (Petrochelidon pyrrhonota) fluttering its wings while it gathers mud in its bill to use as nesting material. Mono Lake Basin, California, USA, June.