Falkland Steamer Duck
Tachyeres brachypterus
The Falkland steamer duck measures between 61 and 74 cm in length and has a wingspan of 84 to 94 cm. It is a fairly large species of duck with males weighing between 3300 and 4800 g, and females between 2900 and 4196 g. The male's plumage is brown to grey with a contrasting light grey-white head. They have a distinctive orange bill. The wings have white secondary feathers and large, featherless spurs. The stubby tail is brown-grey. The eyes are brown with a contrasting white eye-ring and a faint white eye-streak. Voice: The Falkland steamer duck's vocalizations are similar to those of the flying steamer duck. Males can be heard year-round, but they are especially vocal during the breeding season, during which they use their vocalization to defend their territory. Their call consists of loud rasping whistles and repeated sharp ticking notes. Females usually sing with the males and produce deeper grunts.
ID text from Wikipedia, CC BY-SA 4.0
Fuegian Steamer Duck
Tachyeres pteneres
This is the largest of the steamer duck species. It is a massively built waterfowl at 3.5–7 kg (7.7–15.4 lb) and 65–84 cm (26–33 in) in length, with the males noticeably larger than the females. Males weigh an average of 5.34 kg (11.8 lb) while females weigh around 4.2 kg (9.3 lb) on average. The wingspan is 85–110 cm (33–43 in), the wings being too small to functionally allow the birds to take flight. Instead, the wings are used like paddles to help skim rapidly across the surface of the water.
ID text from Wikipedia, CC BY-SA 4.0
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