This
Month in Yellowstone
Cliff Swallows in Partially Constructed Nests
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NPS Photo by Erik Hendrickson
Cliff swallows don't just build their nests on cliffs. When
buildings constructed by people are suitable they can support dozens of
cliff swallow nests. When these nests are completed they will look like
spherical clay pots with a hole in one end. Be sure to see the video
of cliff swallows shot in 2004.
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