This video says about itself:
Watch two of the largest (and most majestic) species of the Panama Fruit Feeder cam square off while foraging on bananas. While the Rufous Motmot and Chestnut-headed Oropendola are roughly the same size, there’s no question which individual is dominant in these interactions.
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Meanwhile on this video, clay-coloured thrushes have a quarrel of their own.