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I shot this video through a window with distracting reflections, but felt the Golden-crowned Kinglet conspecific aggression (inter-species dispute) was worth sharing. Golden-crowned Kinglets, North America's smallest songbirds, are endearing, but these tiny creatures can have huge tempers that flare "red".
Males have a small patch of red on the crown surrounded by yellow. This red patch flares during displays for attracting females and, as shown in the video, disputes.