The Gray-headed Tanager has a peculiar diet: they like to eat insects that are flushed out by passing Army Ant swarms. They gather in groups around the swarms to wait for the unsuspecting victims to try an escape. The feeding can transform into a frenzy, with birds flying from one side to another in a fast fashion. I met this bird in Refugio Los Cusingos, on a Birdwatching Trip with Fundación Rapaces de Costa Rica. A group of at least eight individuals were hunting just by the side of the trail, along with at least two Tawny-winged Woodcreepers, one of which seemed to be a Juvenile, as the other fed him at least once.