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sucking. Sapsuckers drill regular holes in horizontal rows in tree trunks. Then they return to these holes periodically to sip up the sweet sap that accumulated.
Birds are great opportunists and quickly take advantage of a new food supply. Other birds. Downy Woodpeckers along with warblers, kinglets and hummingbirds, drink the sweet sap that results from the sapsucker's systematic hole drilling. In warm weather insects gather to take advantage of the sweet sap. Birds gather in to snap up the ' insects. Whether or not sapsuckers resent others taking advantage of their labor and try to drive other birds off, I do not know. I found no references to it.
There is an ornithological term for this "eating at the same table." The word is commensalism. Definition: "...term for the actions of birds and other animals while profiting from certain habits of their neighbors, without important effects on those neighbors." That is from THE AUDUBON SOCIETY ENCYCLOPEDIA OF NORTH AMERICAN BIRDS by John Terres. I cannot recommend this volume enough.
That definition set me to wondering. The word ’animals’ includes us humans. We are, after all, members of the Animal Kingdom. Are we indulging in commensalism when we sit down to one of the feasts that occur at Thanksgiving and Christmas? I suppose the answer lies in the interpretation of
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