Andean Coot
Fulica ardesiaca
The Andean coot is 40 to 43 cm (16 to 17 in) long. It has two color morphs that are present in both subspecies. Both morphs are mostly slaty gray that is blacker on the head and neck. Their secondaries usually have white tips. One morph has a chrome yellow bill that is paler yellow and sometimes green on the tip, a deep chesnut frontal shield, and green legs and feet. The other has a white bill, a white to orange-yellow frontal shield, and slaty legs and feet. Voice: The Andean coot's usual call is "a low 'churr' or harder 'hrrp'" that is often repeated. Females make a "low chitter".
ID text from Wikipedia, CC BY-SA 4.0
White-winged Coot
Fulica leucoptera
The white-winged coot is 35 to 43 cm (14 to 17 in) long and weighs about 400 to 600 g (14 to 21 oz). The sexes are alike. Adults have a yellow to greenish yellow bill and a small yellow to orange-yellow frontal shield, though these colors may further vary. Their legs and feet are pale sea green to yellow-green and have blackish toes and joints. Their plumage is slaty gray that is blacker on the head and neck. They have white undertail coverts, and wide white tips on the secondaries provide the English name. Voice: The white-winged coot is very vocal, making a "variety of loud, hollow cackling calls and clucking notes" some of which sound like human laughter. Aggressive males make a "huc" call.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Andean Coot and White-winged Coot.