Red-breasted Merganser

Mergus serrator

Genus · Typical Mergansers Family · Ducks, Geese, and Swans
Observation tips Difficulty: MODERATE
Best time
🕒 Any
Activity
☀️ Diurnal
Best months
1
2
3
4
5
6
7
8
9
10
11
12
Observation habitat
River mouthsShorelines

Look for them in coastal bays. Use the shaggy 'double crest' and the thin bill to distinguish them from Goosanders.

Red-breasted Merganser

♂ Male · ♀ Female

Stats
Wingspan70–86 cm
Weight800–1350 g
Length52–58 cm
Lifespan wild5–12 yrs
Size
XS
S
M
L
XL
Nesting
Nest typeScrape
Clutch size6–12 eggs
Incubation28–32 days
Breeding months
1
2
3
4
5
6
7
8
9
10
11
12
Regional Status (Europe)
LC
Least Concern (Europe)
IUCN Red List
MigrationMigratory
Social BehaviourFlocking

Diet: Piscivore

🦀Crustaceans
🐟Fish
🦗Insects

Habitat

🌊 Marine🏞️ River❄️ Tundra
✦ Fun Fact

This species can fly at speeds up to 130 km/h (80 mph). This makes it one of the fastest ducks in level flight.

About

A slim diving duck with a shaggy crest. It is more common in saltwater and coastal waters than the Goosander. It is slender with a very thin, slightly upturned red bill. It is a summer visitor to northern coasts and a winter resident further south. Its 'punky' double-crest gives it a wild appearance.

Behaviour

Red-breasted Mergansers are fast, agile divers. They hunt in small groups in shallow coastal waters. Their courtship display involves the male stretching his neck and 'kicking' water while making a rasping sound. In flight, they show large white wing patches and fly low over the waves.

Sexual Dimorphism

♂ Male

The male has a dark green head with a long, shaggy crest and a white collar. He has a mottled rusty-red breast and bright red eyes.

♀ Female

Similar to a female Goosander but slimmer with a thinner bill. The brown of her head blends gradually into the grey of her neck with no sharp line.

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