Do Mergansers Mate for Life?

Males and females of the hooded merganser form monogamous pairs and they remain together until the female has selected a nesting cavity and completed laying her clutch.

Are common mergansers monogamous?

Common mergansers form mated pairs that last for at least one mating season and may last over a number of mating seasons. Pairs are formed in late winter, when a male circles a female and displays with his neck stretched forward and head feathers erect. Common mergansers breed once per year, in the summer.

Where do mergansers sleep?

This fish-eating duck is the typical merganser of freshwater lakes. Its flocks are usually small, but these may combine into big concentrations sometimes at large reservoirs. Common Mergansers living along rivers may spend hours resting on rocks or on shore.