How do mergansers propel themselves underwater while pursuing prey?

Answer

They employ their wings rapidly underwater, similar to penguins or seals.

Mergansers are true diving ducks that utilize their wings in a manner comparable to seals or penguins, beating them quickly beneath the surface to achieve efficient underwater mobility and pursue fish.

How do mergansers propel themselves underwater while pursuing prey?
birdfishDivingwaterfowlMerganser