Common Scoter vs Red-breasted Merganser

In short

The Common Scoter is a sooty black duck with a distinctive yellow patch on its bill, while the Red-breasted Merganser has a more slender profile with a spiky crest and a red bill. Both species are adapted to aquatic environments, but their plumage and bill shape are the most reliable distinguishing features.

Identification tips

1. Look for the yellow patch on the bill of the Common Scoter. 2. Note the spiky crest and red bill of the Red-breasted Merganser. 3. Observe the habitat: Common Scoters are more likely at sea, while Red-breasted Mergansers are found in coastal and riverine environments.

Size

Common Scoter is generally heavier and has a broader body compared to the more slender Red-breasted Merganser.

Plumage

Common Scoter males are uniformly sooty black with a yellow patch on the bill, while females are dark brown. Red-breasted Mergansers have a spiky crest, and males have a distinctive reddish breast and white neck ring.

Habitat

Common Scoters are often found at sea, whereas Red-breasted Mergansers prefer coastal bays, river mouths, and large water bodies.

Voice

Common Scoter males produce thin, piping whistles, while Red-breasted Mergansers are generally silent.