It is extremely important to understand bone structure as an artist. With that in mind, the mother of Shawanaisha, Sileata has the amazon woman bone structure. While Shawanaisha’s father Tumoonuk has the bone structure of a cave man.
Even though the book setting is in the year of 3050, bone structures change slightly over time.
I discovered changes when I visited the Cairo museum in Egypt. The bone structure of the Egyptians changed over time, depending upon which country was invading them at the time.