“The Day is Done,” Lester del Rey, 1939 – The story of Hwoogh, a Neanderthal and one of the first victims of progress. Hwoogh tries to exist side-by-side the clever Cro-Magnons, even living with one as a mate, but eventually their bigotry becomes a threat to him and their children attack him.
Comments: Read in Great Science Fiction Stories of 1939.
Author: Wikipedia: “Lester del Rey (June 2, 1915 – May 10, 1993) was an American science fiction author and editor. Del Rey was the author of many of the Winston Science Fiction juvenile SF series, and the editor at Del Rey Books, the fantasy and science fiction branch of Ballantine Books, along with his fourth wife Judy-Lynn del Rey.”