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Entertaining Bufflehead ducks swim in Lake Ontario
Bufflehead ducks swim buoyantly, dive easily, and take flight by running a short distance on the surface. They fly low over the water and higher over the land. To dive, Bufflehead ducks compress their plumage to squeeze out air, then give a slight forward leap and plunge powerfully downward. They hold their wings tightly against their bodies underwater and use only their feet to propel themselves. At the end of a dive, they may bob to the surface like a cork. Throughout the day they alternate between bouts of feeding, swimming alertly, preening, and sleeping. Bufflehead are seldom seen on dry land: females walk only when they lead their ducklings from the nest to the water or when they’re forced to switch ponds with their ducklings. Males court females by flying over them, skiing to a stop on the water with their crests raised, and bobbing their heads. During the breeding season, territorial birds attack intruders by flying or swimming underwater at them and thrashing at them with their wings. When a pair of Buffleheads intrudes into a nearby territory, the male that owns the territory often chases the intruding female, and her mate follows them in hot pursuit. Males leave their mates during incubation in order to molt, but return to the same mate multiple years in a row (one of the few duck species in which this is true.)
Bufflehead dive for aquatic invertebrates, crustaceans, and mollusks. They typically swallow their food while still underwater. Dives last on average about 12 seconds and rarely more than 25 seconds, typically staying on the surface another 12 seconds or so before diving again. Bufflehead forage in open, shallow water over sparse submerged vegetation or over mudflats that would be exposed at low tide. On freshwater they mostly eat damselfly and dragonfly larvae, midge larvae, water boatmen, mayfly larvae, caddisfly larvae, large zooplankton such as amphipods, and snails and clams in winter. They eat some plant matter in fall and winter, mainly seeds of pondweeds and bulrushes. In saltwater, Bufflehead eat shrimp, crabs, amphipods, isopods, snails, mussels, herring eggs, sculpins, and ratfishes. Downy ducklings sometimes dabble at the surface rather than diving.
Bufflehead ducks are funny and entertaining to watch. As soon as they hear a strange sound they instantly disappear!
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