Related Program: NatureNotes Cliff Swallows Make Mud Nests By Rudy Mancke • Jul 2, 2018 Related Program: NatureNotes TweetShareGoogle+Email Cliff swallows nesting under a bridge. Marlin Harms, via Wikimedia Commons The colonial nesting birds are often found on cliff faces in the western U.S. In South Carolina, you will often find them under bridges. Listen Listening... / 1:00 NatureNotes is a production of South Carolina Public Radio. Tags: NatureNatureNotesSCETV Appscetv.orgbirdsTweetShareGoogle+EmailView the discussion thread.