The picture used is "Tsalal" by bensen-daniel, licensed for reuse under the Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 License (https://creativecommons.org/licenses/by-nc-nd/3.0/)

Unfortunately the picture was one critical error: the natives of Tsalal wore black animal skins, not white. Oh well, this was literally the only picture I could find that was even remotely on topic, so we'll just have to live with it.

http://www.gutenberg.org/files/51060/51060-h/51060-h.htm#chap19