How to Identify a Ruddy Duck (Oxyura jamaicensis)
Quick answer
Ruddy Duck, Oxyura jamaicensis: 5 field marks, size, habitat and range, and how to tell it from Masked Duck, quoted from Audubon, Ducks Unlimited and USFWS.
Updated 2026-09-10 · Sources: Ducks Unlimited, Audubon

Found one? Take a photo to identify it.
Download on the App StoreWhat are the key facts?
- Scientific name: Oxyura jamaicensis
- Group: stiff-tailed duck
- Size: Length 13.4-16.5 in (34-42 cm); wingspan 22 in-2 ft (56-62 cm)
- Habitat: Fresh marshes, ponds, and lakes; salt bays in winter; breeds on fresh or alkaline lakes and ponds with extensive marshy borders
- Range in North America: Breeds across the western US/Canada prairie pothole region and locally in the east; winters across the southern and coastal US
- Behavior clue: Typically silent; during courtship, males make a belching sound as part of the 'Bubbling Display'
Field marks to check on a Ruddy Duck
- Bill: Male: bright pale blue bill with a dark tip in breeding season
- Head pattern: Male: black crown/cap contrasting with a distinct white facial patch (white cheeks)
- Tail: Male and Female: stiff tail feathers, often cocked up in the air
- Body pattern: Male: ruddy (reddish-brown) body color in breeding plumage
- Head pattern: Female and juvenile: dusky gray-brown overall with a pale buffy cheek patch crossed by a single dark stripe below the eye
Ruddy Duck vs Masked Duck
Female and young Ruddy Ducks show only one dark facial stripe below the eye, and adult male Ruddy Ducks have a plain pale cheek with no stripes, unlike Masked Duck's facial pattern
Where and when to look
Fresh marshes, ponds, and lakes; salt bays in winter; breeds on fresh or alkaline lakes and ponds with extensive marshy borders Breeds across the western US/Canada prairie pothole region and locally in the east; winters across the southern and coastal US
Behavior that helps
Typically silent; during courtship, males make a belching sound as part of the 'Bubbling Display'
How to photograph it for identification
Shoot from water level if you can, with the sun behind you, so head pattern and the wing patch show their true colors. Get one frame with the bird side-on and one as it stretches or flaps, which exposes the speculum and belly. Note who it is swimming with; ducks flock by species. The app names the likely species; confirm with the marks above, and check the female separately, since females of many ducks look alike.
FAQ
What does a Ruddy Duck look like?
Male: bright pale blue bill with a dark tip in breeding season Male: black crown/cap contrasting with a distinct white facial patch (white cheeks)
How do I tell a Ruddy Duck from a Masked Duck?
Female and young Ruddy Ducks show only one dark facial stripe below the eye, and adult male Ruddy Ducks have a plain pale cheek with no stripes, unlike Masked Duck's facial pattern
How big is a Ruddy Duck?
Length 13.4-16.5 in (34-42 cm); wingspan 22 in-2 ft (56-62 cm)
Where are Ruddy Ducks found?
Breeds across the western US/Canada prairie pothole region and locally in the east; winters across the southern and coastal US
More in Duck and Raptor Identification
- How to Identify a Canvasback (Aythya valisineria)
- How to Identify a Redhead (Aythya americana)
- How to Identify a Ring-necked Duck (Aythya collaris)
- How to Identify a Greater Scaup (Aythya marila)
- How to Identify a Lesser Scaup (Aythya affinis)
- How to Identify a Bufflehead (Bucephala albeola)
- How to Identify a Common Goldeneye (Bucephala clangula)
- How to Identify a Hooded Merganser (Lophodytes cucullatus)
- How to Identify a Common Merganser (Mergus merganser)
- How to Identify a Red-breasted Merganser (Mergus serrator)
Related
Find out what bird that really is.
Start with a single photo.
Found one? Take a photo to identify it.
Sources
- Ducks Unlimitedwww.ducks.org/hunting/waterfowl-id/ruddy-duck
- Audubonwww.audubon.org/field-guide/bird/ruddy-duck
Compiled by the BirdLens editorial team
Every fact on this page is taken from the sources listed above; numbers and prices are copied from the source, and prices name the guide or auction and its date. Research and drafting were assisted by AI, and each claim was then checked against the cited sources. Checked 2026-09-10. We do not buy, sell or grade items; the app identifies what you photograph and points you to these references.