Yellowstone National Park, Wyoming, USA. Cliff swallow building mud nest. Depending on mud supply and weather, nest construction may take 1 to 2 weeks.

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Photo credit: © Janet Horton / DanitaDelimont / Alamy / Afripics
License: Royalty Free
Model Released: No

Keywords: building, cliff, hang, horton, janet, mud, nest, nesting, sticky, swallow, wildlife, wyoming