Illustration by George F. Sandström, © Delaware Museum of Natural History
Continuing with the 5th entry in this series, here is a beautiful illustration by George F. Sandström which appears on Plate 80 of Woodpeckers of the World by Lester L. Short, published by the Delaware Museum of Natural History (1982). The bird at the upper portion of the illustration is a male Red-necked Woodpecker and a male Robust Woodpecker appears below.
You can find a detailed profile that I authored of the Red-necked Woodpecker at the Cornell Lab of Ornithology's Birds of the World site at this link: