Ocellated Antbird

Overview

The ocellated antbird (Phaenostictus mcleannani) is the only member of its genus and one of the most striking professional army-ant followers in the neotropics. About 19 cm long, with a complex pattern of black-edged buff scallops (“ocelli”) covering the back and breast, a chestnut crown, and a startling cobalt-blue patch of bare skin around the eye. Both sexes look alike. The bill is long and slightly hooked, the legs powerful — built for the species’ ground-and-trunk hunting style.

This is a professional army-ant follower: it spends nearly every foraging hour over an active Eciton burchellii (or related) swarm, snatching arthropods, small lizards, and even small snakes that the ants flush from the leaf litter. When swarms go dormant (bivouac phase), birds wander widely searching for the next active raid. Multiple unrelated individuals attend a swarm in a clear social hierarchy.

Why Tortuguero

The ocellated antbird is one of the prize Caribbean-lowland-rainforest birds for any visitor — its dependence on continuous primary forest and active army-ant populations means it’s only present in well-protected, contiguous habitat. Tortuguero’s intact forest matrix supports the species reliably, and the park’s network of canals and trails gives multiple chances to intersect an active swarm. The combination of ocellated antbird + spotted antbird + bicolored antbird at a single swarm is one of the canonical Caribbean-lowland antbird trifectas.

How to see them (honestly)

• The answer is always: find an active army-ant swarm. Without one, you’ll likely not see the species
• Ask the lodge or guide about recent swarm sightings; ant biviouacs move daily
• At a swarm, the birds are remarkably tame — focused on the hunt, indifferent to observers at 3–5 m
• The harsh chattering vocalizations at a swarm are often the first clue something is happening
• Look at the ground and at low perches over the swarm column; the cobalt-blue eye patch is the clincher

Status note

The IUCN rates Phaenostictus mcleannani as Least Concern, but the species is a high-priority indicator of forest integrity: it depends on large unbroken tracts that can support stable populations of army ants. Population trends are downward in fragmented landscapes. Tortuguero, as a large contiguous protected area, is one of the more secure strongholds in Costa Rica.