Diving Waterfowl Identification: Canvasback to Bufflehead

Diving waterfowl identification starts with deciding whether the bird is a diver at all. Ducks Unlimited explains that dabbling ducks feed by tipping up with their heads underwater while staying at the surface, while diving ducks submerge completely. The US Fish and Wildlife Service guide Ducks at a Distance adds field checks:

• Takeoff: most divers patter along the water before becoming airborne.
• Wings: divers' wing patches lack the brilliance of a dabbler's speculum, and because their wings are small for their body weight they beat faster.
• Feet: with short tails, divers use their large feet as rudders, and the feet are often visible in flight.
• Water: divers use larger, deeper lakes and rivers and coastal bays; puddle ducks prefer shallow marshes and creeks.

Wikipedia notes divers' legs sit farther back on the body, which makes them awkward on land. Ducks Unlimited lists 21 diving duck species commonly found in North America, against 12 common dabblers.

• Canvasback (22 in, 3 lb, USFWS): Wikipedia describes the drake's chestnut-red head, black breast and whitish back and sides, and a long, sloping, wedge-shaped head with a black bill; it is North America's largest diving duck. USFWS says it is the swiftest of our ducks, with a steady rushing wing sound.
• Redhead (20 in, 2.5 lb, USFWS): a rounder head, shorter bill and, in drakes, yellow eyes; the drake's bill is pale blue with a black tip (Wikipedia). The canvasback's eyes are red and its head long, so head profile separates them fastest.
• Lesser and greater scaup (17 and 18.5 in, USFWS): nearly identical on the water. USFWS says the light band on the trailing edge of the wing runs almost to the tip in greater scaup but only about halfway in lesser. Wikipedia notes the lesser's peaked rear crown versus the greater's smoother, rounder head, and warns that purple versus green head gloss is unreliable in changing light. Greater scaup prefer large open water; lesser scaup often use marshes and ponds (USFWS).
• Ring-necked duck (17 in, USFWS): the drake's faint brown neck ring never shows in the field; look instead for the conspicuous light bands at the tip and base of the bill, and dark wings without the scaup's white edge. More often on fresh marshes and wooded ponds.

• Goldeneyes (common and Barrow's, both 19 in, USFWS): strong fliers, singly or in small flocks, often high up. Their wings make a distinctive whistling sound in flight, which earned them the name whistlers. Most winter on coastal waters and the Great Lakes; inland they like rapids and fast water. Barrow's is mainly western, and the hens of the two species look alike.
• Bufflehead (14.5 in, 1 lb, USFWS): very small, boldly black and white, with low, swift flight. Unlike most divers, it can fly straight up from the water. Flocks in feeding areas are small, often 5 or 6 birds, with more hens and young than adult drakes.

• Ruddy duck (15.5 in, USFWS): often dives or swims away from danger instead of flying; its small wings beat so fast it looks like a bumblebee. Drakes often cock the tail upright, the only species that habitually does so.
• Common merganser (25.5 in, 2.5 lb): one of the largest ducks, more common than the red-breasted merganser on inland waters; flocks fly low in follow-the-leader style (USFWS).
• Red-breasted merganser (23 in, 2.5 lb): winters mainly on coastal waters including the Gulf of Mexico, less on the Great Lakes; hard to separate from the common merganser in flight (USFWS).
• Hooded merganser (18 in, 1.5 lb): usually in pairs or tiny flocks; winters inland in all coastal states and seldom goes to salt water (USFWS).

Scoters, eiders and mergansers also dive for food, and Wikipedia notes they are often called diving ducks in North America although they belong to a separate group of sea ducks. USFWS describes the three scoters as sea ducks that winter on open coastal waters, with the white-winged scoter among the heaviest and largest of all ducks (21.5 in, 3.5 lb).

None of the top US guides covers European birds. The Wildlife Trusts list these diving ducks in the UK:

• Tufted duck: the most common; drakes black and white with a long tuft on the head, hens brown with a smaller tuft.
• Scaup: larger than tufted duck with a rounder head and no tuft; a winter visitor, usually on the coast.
• Pochard: drake with pale grey body, black breast and tail end, and bright chestnut head; hen grey-brown with a peaked crown.
• Goldeneye: black and white drake with a large rounded head and golden eye.
• Goosander: drake with dark bottle-green head, red bill and largely white body; the hen's red-brown head contrasts sharply with a white chin.
• Smew: the smallest sawbill, a rare winter visitor; drakes white with black markings.

At a distance, behavior identifies more ducks than color does. USFWS notes that canvasbacks shift from waving lines to temporary V's and make a steady rushing sound; redheads travel in V's and always seem in a hurry; scaup move in rapid, erratic, compact groups; goldeneyes whistle. Voices help too: drake redheads purr and meow, drake lesser scaup purr, drake greater scaup give a discordant "scaup, scaup", and drake goldeneyes a piercing "speer-speer".

USFWS makes the case that hunters who can identify ducks on the wing avoid species that are protected or scarce and can take extra birds of species allowed in higher numbers. Regulations change every season and differ by flyway and state, so check the current rules before hunting, and do not shoot a bird you cannot identify.

Photograph the bird side-on on the water so the head shape and bill show, then in flight for the wing stripe. A short video of takeoff shows whether it patters along the water. Photograph it and the app identifies it, with free scans every day.

Research and drafting for this page used AI assistance. Every measurement, date, price and claim was then checked against the sources listed below, which were opened and read on 2026-09-25. Where two sources give different numbers, both are shown.