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Cliff Swallows (Petrochelidon pyrrhonota) Photos |
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Cliff Swallow (Petrochelidon pyrrhonota) nests. Only the swallows that have learned to build a downward-angled entrance to their nests are able to keep the House Sparrows from taking over.
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Photographed by Scott J. Spangenberg at Pipe Creek Bridge
in Pipe Creek, TX, USA on Friday, April 23, 2004.
Canon D60, EOS 100-400mm IS 400.0 mm 1/60 sec f5.6 +0.0 400.
Copyright 2004, All Rights Reserved. Image 23 of 23, file: 2004-04-02-286.JPG. |