This is the Pileated Woodpecker, in my opinion the most handsome of a very beautiful group of birds. Both males and females have this striking red crown.
Fannie Hardy Eckstorm writes in her 1901 woodpecker treatise:
one of the most persistent of our tree-climbers and more than any other woodpecker I ever observed given to scratching rapidly round and round a tree-trunk, clinging at ease in almost any position except head-downward, and drilling incessantly and at all seasons for grubs; he is a typical woodpecker of the largest size
Source: Fannie Hardy Eckstorm, The Woodpeckers. Boston: Houghton, Mifflin and Co.: 1901.