Yellow-throated Toucan

Overview

The yellow-throated toucan (Ramphastos ambiguus) is the larger of the two Ramphastos toucans in Tortuguero, measuring 47–61 cm from bill tip to tail — comparable in size to a small crow but with a bill accounting for a significant portion of that length. The plumage is black on the back and wings with a bright yellow throat and upper breast patch, red undertail coverts, and a pale yellow-white rump. The bill is predominantly black with a yellow stripe along the culmen, quite different from the multicolored bill of the keel-billed toucan; this is the easiest field separation between the two species.

The Costa Rican subspecies (R. a. swainsonii), sometimes called the chestnut-mandibled toucan, has a distinctive reddish-brown lower mandible that contrasts with the black upper mandible. Like other large toucans, this species is mainly frugivorous but takes insects, nestlings, and eggs when available. It nests in tree cavities and tends to occupy upper canopy in old-growth forest.

Why Tortuguero

The yellow-throated toucan is a canopy species that needs large tracts of tall primary forest — exactly what Tortuguero’s core zone provides. Where the keel-billed toucan is common at forest edges and canal margins, the yellow-throated toucan is more typically encountered inside the primary forest or at the crown level of the tall canopy along the main canal. Both species are seed dispersers for large-fruited trees; their presence signals an ecologically intact forest with enough fruiting resources to sustain large-bodied birds.

How to see them (honestly)

• Separate it from the keel-billed toucan first: look for the all-black-with-yellow-throat pattern and the two-tone (black and chestnut) bill. The keel-billed toucan has a multicolored bill and a more extensive yellow face.
• Call is the most reliable cue — a loud, far-carrying yelping or croaking, different in quality from the flat croak of the keel-billed toucan. Guides distinguish the two by call as a matter of routine.
• Treetops along intact forest sections of the main canal; less likely at open edges or near the village.
• Not as conspicuous as the keel-billed toucan. You may hear this species more often than you see it clearly.

Status note

The IUCN currently lists Ramphastos ambiguus as Least Concern, though the population trend is declining due to habitat loss from forest conversion across its range in Central and South America. In Costa Rica the Pacific-slope populations face more pressure than the Caribbean-side, which retains better forest cover. Within Tortuguero’s protected area, the species is resident and stable.