sentences:  Hummingbirds and other gleaners are also sometimes attracted to the sap wells created by sapsuckers.Sapsuckers, which are in the woodpecker family, drill small holes in living tree branches to get the sap flowing.The sap and the insects it attracts are then consumed, and rufous hummingbirds have been observed to follow the movements of sapsuckers and take advantage of this food source.