Robert Bruce Horsfall (1869 - 1948)

Robert Bruce Horsfall was an American wildlife illustrator. His paintings were included in several works from the early 20th century.
(source: wikipedia)
A Year With The Birds (PDF, 191 pp)
Bird and Animal Paintings (PDF, 63 pp)
Little Mitchell: The Story of a Mountain Squirrel
Summer
The Fall of the Year
The Spring of the Year
Winter