butter-duck

A shot at mallard, black-head, butter-duck, loon, wild goose, or blue-winged teal, as they follow the river's winds northward in the spring-time, will stop the ploughs furrowing its fertile bottoms as far as its echoes roll around mountain-juts, and cause the hands that held the lines to grasp old-fashioned rifles for a chance at the winged passers.

Lippincott's Magazine, August, 1885 Various

While we worked the air above us was filled with the beat of wings, as in skeins, wedges, and crescents the wild fowl, varying from the tiny butter-duck to the brant goose and stately crane, went by on their long journey from the bayous by the sunny gulf to the newly thawn tundra mosses beside the Polar Sea.

Lorimer of the Northwest Harold Bindloss 1905