This video says about itself:
Watch a pair of Blue-gray Tanagers join a butterfly on the Panama fruit feeder platform. These soft-colored tanagers are a ubiquitous species of the humid tropic lowlands. They typically travel in pairs or small single-species flocks, briefly joining mixed-species flocks at fruiting trees.
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The Panama Fruit Feeder Cam is a collaboration between the Cornell Lab of Ornithology and the Canopy Family.