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15". Adult sooty grey; head and neck black; bill thick, white, black near tip; sides of undertail white. Feet not webbed, but toes lobed. Immature paler grey below; bill silvery. Dives and skitters over surface to become airborne like a diving duck, swims like a duck-but not a duck. Usually in rafts (flocks). Voice is grating kuk notes.
Marshes and ponds
Resident in South Florida Oct-April, rest of the year, all through Florida.