"All members of an Acorn Woodpecker group spend large amounts of time storing acorns. Acorns typically are stored in holes drilled into a single tree, called a granary tree. One granary tree may have up to 50,000 holes in it, each of which is filled with an acorn in autumn. The Acorn Woodpecker will use human-made structures to store acorns, drilling holes in fenceposts, utility poles, buildings...