- Any one or several species of swifts of the genus
Acanthylis, or Chaetura, and allied genera, in which the shafts of the
tail feathers terminate in rigid spines. - Any one of several species of South American and Central
American clamatorial birds belonging to Synallaxis and allied genera of
the family Dendrocolaptidae. They are allied to the ovenbirds. - The ruddy duck.