A northern duck (Dafila acuta), native of both continents. The adult male has a long, tapering tail. Called also gray duck, piketail, piket-tail, spike- tail, split-tail, springtail, sea pheasant, and gray widgeon.
- A duck (Anas acuta) of the Northern Hemisphere, having gray, brown, and white plumage and a sharply pointed tail. Also called sprigtail.