Abstract
I observed a juvenile male Bare-necked Umbrellabird (Cephalopterus glabricollis) forage on arthropods flushed by a large swarm of the army ant Eciton burchellii in the Caribbean foothills of Costa Rica. Apparently, this is the first report of this species attending an army ant swarm. At least 60 birds of eight different species were foraging at that swarm, the largest assemblage of army ant-following birds reported in the Neotropics.
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