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Waterfall Glen 4/2015

Waterfall Glen 4/2015

Cliff Swallow. Spotted spotted from birding boat tour, Horicon Marsh,  5/14/16.  A group of them nearly blended in perfectly on a dead tree branch.

Spotted spotted from birding boat tour, Horicon Marsh, A group of them nearly blended in perfectly on a dead tree branch.

Two cliff swallows constructing mud nests.  photo Ken Thomas - KenThomas.us (personal website of photographer)

Two cliff swallows constructing mud nests.us (personal website of photographer)

Cliff Swallow - 5/6/12 - across from Stearn's Lake, Broomfield

Almost always found in large groups. Clusters of their intricate mud nests cling to vertical walls.

Cliff Swallow -- April 26, 2013; Beaver Dick Park, Madison County, Idaho

Cliff Swallow, Identification, All About Birds - Cornell Lab of Ornithology

CLIFF SWALLOW. © Cameron Rognan, Bishop, California, June 2005, http://www.flickr.com/photos/cameronrognan/3752993346/

Cliff Swallow, Identification, All About Birds - Cornell Lab of Ornithology

Cliff Swallow - Bird on Wire Walden CO by Shadow848327

Cliff Swallow - Bird on Wire Walden CO by Shadow848327

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