ruddy duck

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A North American duck (Oxyura jamaicensis) having stiff pointed tail feathers and, in the male, brownish-red upper plumage and a black-and-white head. Also called sprigtail.

Wiktionary

1. n. Oxyura jamaicensis, a small stifftail duck. The males have a rust-coloured body.

GNU Webster's 1913

1. adj. (Zoöl.) an American duck (Erismatura rubida) having a broad bill and a wedge-shaped tail composed of stiff, sharp feathers. The adult male is rich brownish red on the back, sides, and neck, black on the top of the head, nape, wings, and tail, and white on the cheeks. The female and young male are dull brown mixed with blackish on the back; grayish below. Called also dunbird, dundiver, ruddy diver, stifftail, spinetail, hardhead, sleepy duck, fool duck, spoonbill, etc.

WordNet 3.0

1. n. reddish-brown stiff-tailed duck of North America and northern South America