Red-breasted Merganser (Mergus serrator)

The Red-breasted Merganser is a sea duck commonly found in northern regions of North America and Eurasia. Known for their striking appearance, the males of this species display striking contrasts of black and white feathers with a distinctive rusty-red patch on their breast. Meanwhile, females exhibit a more subdued brown coloration accented by a similarly colored head and white throat. Their thin bills, serrated at the edges, are perfectly designed for catching fish, their primary food source.

These ducks are built for life on the water. They have webbed feet, which is helpful for swimming and diving underwater in search of prey. The Red-breasted Merganser is known for being an accomplished swimmer, able to dive up to 30 meters in search of prey. When it swims, its body rides quite low in the water due to the alignment of its legs.

The Red-breasted Merganser's breeding grounds range throughout northern regions, primarily near freshwater or coastal estuaries. They are monogamous throughout the breeding season, with the males performing an elaborate courtship dance for the females. Once she accepts him, the male will aggressively protect the pair's territory. A female lays an average of nine eggs, with incubation lasting around a month.

The Red-breasted Merganser is classified as a species of "Least Concern" by the International Union for the Conservation of Nature (IUCN). However, their population has experienced significant declines in parts of their range, particularly in Europe. Habitat destruction, pollution, and overfishing are primary concerns for their conservation.

Overall, the Red-breasted Merganser is a fascinating species with remarkable adaptations to life on the water, making it a beloved subject for birdwatchers and nature enthusiasts alike.

Other names

Mergus serrator



Red-breasted Merganser

bec de serra mitjà



mali ronac

morčák prostřední

Toppet Skallesluger

Middelste Zaagbek


Harle huppé


Smergo minore


vidutinis dančiasnapis




Длинноносый крохаль

Srednji ronac

potápač prostredný

Serreta mediana



крех середній


örvös bukó


garknābja gaura


srednji žagar