Laurent Geslin / Red breasted merganser (Mergus serrator) male on Lake Geneva, near Geneva, Switzerland

Laurent Geslin / Red breasted merganser (Mergus serrator) male grooming, on Lake Geneva, near Geneva, Switzerland

Marie Read / Red-breasted Mergansers (Mergus serrator) male in foreground performing courtship display to female in background (left), Aurora, New York, USA, April.

Martin Grimm/ BIA / Red-breasted Merganser (Mergus serrator) male taking flight, Mecklenburg-Vorpommern, Germany

Markus Varesvuo / Pair of Red-breasted Merganser (Mergus serrator) on water, Iceland, June

Chris Romeiks / Red-breasted Merganser (Mergus serrator) female, Mecklenburg Vorpommern, Germany

Laurent Geslin / Red breasted merganser (Mergus serrator) male on Lake Geneva, near Geneva, Switzerland

Laurent Geslin / Red breasted merganser (Mergus serrator) male on Lake Geneva, near Geneva, Switzerland

Laurent Geslin / Red breasted merganser (Mergus serrator) male on Lake Geneva, near Geneva, Switzerland

Laurent Geslin / Red breasted merganser (Mergus serrator) female on Lake Geneva, near Geneva, Switzerland

Laurent Geslin / Red breasted merganser (Mergus serrator) male and female on Lake Geneva, near Geneva, Switzerland

Laurent Geslin / Red breasted merganser (Mergus serrator) female on Lake Geneva, near Geneva, Switzerland