Red-fronted Coot
Fulica rufifrons
The red-fronted coot is 38 to 43 cm (15 to 17 in) long. Male specimens can weigh between 685 and 735 g (24 and 26 oz) and females can weigh around 550 g (19 oz). The sexes are alike. Adults have a yellow bill, a dark chestnut-red frontal shield, and olive legs and feet. Unique among coots, their feet are not lobed. Their plumage is almost entirely dark slate gray except for white undertail coverts. Juveniles have a blackish bill, white spots on the throat, and gray-brown plumage with the same white undertail coverts as adults. Voice: The red-fronted coot makes a "long, chattering series of calls, described as 'togo togo togo..., cu cu cu..., puhúh puhúh puhúh...', etc." It also has a "tuc" alarm call.
ID text from Wikipedia, CC BY-SA 4.0
Red-gartered Coot
Fulica armillata
The red-gartered coot is 43 to 51 cm (17 to 20 in) long. The sexes are alike. Adults have a yellow bill and frontal shield with a patch of red between them. (The bill is sometimes reddish.) Their legs are orange-yellow to yellow with a pale red "garter" above the ankle. Their plumage is slaty gray that is blacker on the head and neck. Their undertail coverts are white. Immature birds have a paler bill than adults and olive legs and feet. Juveniles are drab gray-brown with dusky mottling on a white head and neck. Voice: Male red-gartered coots make a "whistled 'huit'" alarm call, in aggression "an explosive 'pit' and repeated 'wuw'", and when near a female a "repeated soft 'cuit'". The female's alarm call is "yec" and it also makes a "loud, repeated 'terr'."
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: Red-fronted Coot and Red-gartered Coot.