Audubon wrote regarding this large bird, "While in the Great Pine Forest of Pennsylvania, of which I have repeatedly spoken, I was surprised to see how differently this bird worked on the bark of different trees, when searching for its food. On the hemlock and spruce, for example, of which the bark is difficult to be detached, it used the bill sideways, hitting the bark in an oblique direction, and proceeding in close parallel lines, so that when, after awhile, a piece of the bark was loosened and broken off by a side stroke, the surface of the trunk appeared as if closely grooved by a carpenter using a gouge. In this manner the Pileated Woodpecker often, in that country, strips the entire trunks of the largest trees. On the contrary, when it attacked any other sort of timber, it pelted at the bark in a straightforward manner, detaching a large piece by a few strokes, and leaving the trunks smooth, no injury having been inflicted upon it by the bill."