Black-necked Aracari
Pteroglossus aracari
The black-necked aracari is 43 to 46 cm (17 to 18 in) long and weighs 177 to 325 g (6.2 to 11 oz). Males and females have the same plumage and bill coloration, though the female's bill is shorter. Adults of the nominate subspecies have a black head, neck, and throat with chestnut-black ear coverts. Their brown eye is surrounded by blue-gray to black bare skin. Their upperparts are mostly green with a red rump. Their underparts are yellow with a wide red band across the lower breast and greenish thighs. Voice: A common black-necked aracari call is "'tsee-eet' to 'sneet'...sometimes longer as 'tseeeeeee-it'". It also makes a "rattled 'bdd-dddit'" that might be vocal or from rattling the bill.
ID text from Wikipedia, CC BY-SA 4.0
Many-banded Aracari
Pteroglossus pluricinctus
The many-banded aracari is 43 to 46 cm (17 to 18 in) long including the 11 to 12.5 cm (4.3 to 4.9 in) bill. It weighs 215 to 302 g (7.6 to 11 oz). Males' and females' bills are alike in color; the female's is shorter. The bill has an orange-yellow line at its base. Its maxilla is orange-yellow with a wide black stripe on the culmen and a black base. Its mandible is black. Adult males have a mostly black head, throat, and neck but for bare blue-green to green skin around the eye and a chestnut patch behind it. Their back is dark green and their rump is red. Voice: The many-banded aracari's calls are variously described as "seeent", "seeet", "see-yeet", "kyseek", and "kyeek".
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: Black-necked Aracari and Many-banded Aracari.