Related to rough-winged swallow: bank swallows
Either of two swallows (Stelgidopteryx serripennis or S. ruficollis) of the Americas, having outer primary feathers equipped with small barblike hooks.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.