This video from the USA says about itself:
Yellow-bellied Sapsucker drilling sap wells
Yellow-bellied Sapsuckers get their name from the grids of shallow “wells” they carve out of tree tunks, enabling them to consume both the sap that collects and insects that are also attracted. Both sexes of this woodpecker show a crimson red cap and a long white stripe on the folded wings, while males also have a red patch on the throat.
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