Petrochelidon fulva, the cave swallow.

Cave swallows gather mud for their nests near Mayan ruins at Uxmal, in Yucatan, Mexico.
Video (18 seconds)

Cave swallows at their mud nests on the interior walls of Mayan ruins at Uxmal, in Yucatan, Mexico.
Video (54 seconds)

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Cave swallow (All About Birds)

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Video: Linda Reynolds, SFASU Library