See under yellowlegs.
Origin of lesser yellowlegs
First recorded in 1900–05
noun (used with a singular verb)
either of two American shorebirds having yellow legs, Tringa melanoleuca (greater yellowlegs) or T. flavipes (lesser yellowlegs).
Origin of yellowlegs
1765–75, Americanism; yellow + legs
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
(functioning as singular) either of two North American sandpipers, Tringa melanoleuca (or Totanus melanoleucus) (greater yellowlegs) or T. flavipes (lesser yellowlegs), having bright yellow legs
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012