Grey-headed Chachalaca
Ortalis cinereiceps
The grey-headed chachalaca is a medium-sized bird, similar in general appearance to turkeys, with a small head, long strong legs, and a long broad tail. They are 48 to 58 cm (1.6 to 1.9 ft) long and weigh 490 to 540 g (1.1 to 1.2 lb). They have fairly dull plumage, grayish brown above and paler below. The head is dark grey with a red dewlap and the blackish tail is tipped with buff. Their primary flight feathers are bright chestnut. Juveniles are browner overall, especially on the head. Voice: The grey-headed chachalaca is less noisy than plain (O. vetula) or rufous-vented chachalacas (O. ruficauda). Its song is a soft "cha-cha-lac-ah". Flocks give raucous calls described as "kloik, kleeuk kraahk". It also makes a variety of screams, sharp alarm calls, and a quiet purr.
ID text from Wikipedia, CC BY-SA 4.0
Speckled Chachalaca
Ortalis guttata
The speckled chachalaca is 49 to 55 cm (1.6 to 1.8 ft) long. The nominate subspecies is mostly brown above with a darker and grayer head and neck. The mantle has a chestnut wash; the tail has a bronze gloss and the outer feathers are rufous. The throat and breast are dark brown with the eponymous white speckles. The lower breast and belly are light grayish brown and the vent bright rufous. The eye is dark brown to dark reddish brown and is surrounded by bare slate blue skin. O. g. Voice: The song of the nominate speckled chachalaca is a "rhythmic five-syllable phrase rendered ha-ga-GAA-gogok, repeated rapidly." Those of the other subspecies are similar.
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: Grey-headed Chachalaca and Speckled Chachalaca.