The Black Swift in Idaho includes a discussion of the first specimen, the breeding habitat and the function of plumage coloration. The bulk of the publication consists of a biography of Earl Larrison, a prolific author of books and articles on the natural history and ecology of the Northwest: Mammals of the Northwest, Birds of the Pacific Northwest, Washington Wildflowers, Mammals of Idaho, Owyhee: The Life of a Northern Desert, Pilchuck: The Life of a Mountain, Washington Birds, and more; illustrated with a map of the Panhandle Lake area in Washington.