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
Red-knobbed Coot
Fulica cristata
The red-knobbed coot is largely black except for the white frontal shield. It is 35–42 cm (14–17 in) long, spans 75–85 cm (30–33 in) across the wings. Males weigh 770–910 g (27–32 oz), females are slightly smaller and weigh 455–790 g (16.0–27.9 oz). The sexes are alike. As a swimming species, it has partial webbing on its long strong toes. The juvenile is paler than the adult, has a whitish breast, and lacks the facial shield; the adult's black plumage develops when about 3–4 months old, but the white shield is only fully developed at about one year old, some time later.
ID text from Wikipedia, CC BY-SA 4.0
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