William Joseph Long (North Attleboro, Mass., 3 April 1867 – 1952) was an American writer, naturalist and minister. He lived and worked in Stamford, Connecticut as a minister of the First Congregationalist Church.
As a naturalist, he would leave Stamford every March, often with his son, Brian, and two daughters, Lois and Cesca, to travel to "the wilderness" of Maine. There they would stay until the first snows of October, although sometimes he would stay all winter. In the 1920s, he began spending his summers in Nova Scotia, claiming "the wilderness is getting too crowded".
He wrote of these wilderness experiences in the books Ways of Wood Folk, Wilderness Ways, Wood-folk Comedies, Northern Trails, Wood Folk at School, and many others. His earlier books were illustrated by Charles Copeland; two later ones were illustrated by Charles Livingston Bull. Long believed that the best way to experience the wild was to plant yourself and sit for hours on end to let the wild "come to you; and they will!"
Because of the increased public interest in the natural world as a reaction to the Industrial Revolution, Rev. Long's books were finding a large audience and even being issued in schools under the title of The Wood Folk Series. However, his findings and observations clashed with the prevailing scientific wisdom of animal behavior, which believed animals behaved purely on instinct, and could not learn from experience: a bird builds a nest purely by instinct and is not taught the skills required. Rev. Long provided many examples, supposedly from his experience, to cast doubt on that prevailing wisdom, suggesting that in fact animals did learn, and each could become individuals within their species. Some of the more famous observations were that kingfishers would catch fish in a river and then drop them into small pools so their offspring could practice catching the same fish but in an easier environment. He also chronicled a woodcock that made a "splint" for its broken leg. He also wrote of foxes that rode on the backs of sheep to escape hunters and porcupines curling into balls and rolling down hills.