Mark was the first member of his line to adopt an Anglo surname. He had been known by his birth order name, Ną̄ǧíga, "Fourth Son." (Weinhold, 3) The 1912 Indian census shows another of his names to have been Wa Ne He Kah, which is for Wą́nihegá, "He who is Hallooing," which is the name of a Thunderbird. (Longtail) Since the Greens are said to have been of the Bear Clan, this name must be a nickname. His lineage is descended from Black Otter, who maintained that he was an incarnated Thunderbird. This may be the origin of Thunderbird names in the Green family.
The famous Black Otter Warbundle was passed down to him and in turn was passed down to his eldest son Abel.
Mark is present for the 1920 census, but in the 1921 census, his wife is classified as a widow.
Alexander Longtail (Sįčserečka), Buffalo Clan, "The Two Brothers, Waloga and Little Ghost," with interlinear translation by James Owen Dorsey, 4800 Dorsey Papers: Winnebago 3.3.2 (Washington, D. C.: Smithsonian Institution, National Anthropological Archives, October and November, 1893) Story V: 1 - 22.
Frank Weinhold, "Black Otter's Narrative: Wisconsin Native Recollections Relating to Pre-History of the Lewis-Clark Expedition," 1-27, in The Encyclopedia of Hočąk (Winnebago) Mythology.