Telltale signs, and how to fight back
That black and white bird with a red cap and yellow belly is not a traditional woodpecker looking for bugs hiding beneath bark. At work making numerous holes all in a circle around the trunk of your tree is a yellow-bellied sapsucker, who then sucks sap from those wounds.
In early spring, sap migrates to the phloem, the region just beneath the bark, and these birds are eager to suck those juices. Warm days and cool nights make the sap flow hard and furious, and the sapsuckers know it.