What is the dual purpose of the constant, quick flickering or jerking of the Ruby-crowned Kinglet's wings during foraging?

Answer

To maintain balance during maneuvers and potentially flush out hidden insects

The wing flickering serves the dual function of helping the bird maintain balance during its erratic movements and possibly disturbing sedentary insects into revealing themselves.

What is the dual purpose of the constant, quick flickering or jerking of the Ruby-crowned Kinglet's wings during foraging?
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