Canvasback ducks, also known as Aythya valisineria, are a popular game bird in North America. These ducks are identified by their large size, distinct red eyes and distinctive canvas-like back feathers. Some of the synonyms for canvasback duck include red-headed duck, Pike's peak duck, whiteback, oyster duck and bottlehead. These synonyms are often used interchangeably to describe this species of waterfowl. Although canvasback ducks are prized by hunters for their delicious meat, they are also admired by birdwatchers for their unique beauty and fascinating behavior. Whether you call them canvasbacks or one of their many synonyms, these ducks are a fascinating and important part of our natural world.