Red-breasted Merganser Mergus serrator

– medium-sized anatid, about size of Mallard but slimmer
– diurnal migrant, probably also nocturnal
– migrates pairwise or in small to medium flocks in formation

Red-breasted Merganser Mergus serrator, AD M
BIF1966, 01/02/2012, Darss, Martin Grimm
slim silhouette with long neck and thin bill; red bill slightly upcurved without hook, black head (red eye), distinct white collar and dark streaked redish-brown upper breast, white inner wing with two thin black lines and broad black leading edge, black hand -> Goosander (BIF 1630)

Red-breasted Merganser Mergus serrator, AD M
BIF1967, 01/02/2012, Darss, Martin Grimm
flanks greyish (upper flank black with white patches), feet almost reach tail tip -> Goosander (BIF 1631)

Red-breasted Merganser Mergus serrator, AD F (two left), AD M, 2CY M (right)
BIF1972, 15/03/2017, Kühlungsborn, Roland Neumann
M 2CY head black-brown patterned, upper flanks darker than F, upperwing pattern of 2CY M same as F with fine black line in white wing patch (usually missing in F -> Goosander), no contrast between hand and arm

Red-breasted Merganser Mergus serrator, AD F (two left), AD M, 2CY M (right)
BIF1971, 15/03/2017, Kühlungsborn, Roland Neumann
same as BIF1972, brown head of F diffusely merging into grey neck (sharp contrast in F -> Goosander)

Red-breasted Merganser Mergus serrator, 5 AD M
BIF1973, 15/03/2017, Kühlungsborn, Roland Neumann
on greater distance the white collar is the most striking feature

voice: calls during migration not yet sound recorded

comparison species:
Goosander (v)
Common Goldeneye (v)
Common Shelduck (v)
Common Eider (v)

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