the fuegian steamer duck is a large, flightless species of duck found in south america living along rocky coasts and coastal islands from southern chile and chiloé to tierra del fuego; during the breeding season, they move further inland for shelter. they are a hefty duck known for their size; individuals range from 7.7lbs on the small end to over 15lbs (for reference, a wild mallard duck weighs up to 3.5lbs). the steamer-duck family is not closely related to ‘true’ ducks, and their weight actually surpasses many species of geese. the sexes look similar, but females have a darker gray-brown on the head, and reddish-brown on the throat, and they are noticeably smaller than males. while during winter they are typically docile and may join mixed-species flocks, males are incredibly aggressive during the breeding season.