yellowlegs

noun (used with a singular verb)

1. either of two American shorebirds having yellow legs, Tringa melanoleuca (greater yellowlegs) or T. flavipes (lesser yellowlegs).

noun

1. (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