Occasionally one comes across animal behavior that has yet to be understood by humans. If you watch Northern Mockingbirds for any length of time, especially females, you are likely to see them stop and raise their wings half to fully open, in several progressively higher jerky movements. When they do this, their white wing patches are fully exposed.
Ornithologists are not of one mind as to what this behavior achieves. Perhaps it is anti-predator behavior – an attempt to scare would-be nest raiders away. It could be a way of startling insects enough to make them move and thus easier to see and catch. It also could be a form of territorial display/defense. Interestingly, mockingbird species that lack the white wing patches also engage in this behavior.
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