Is there a genetic explanation for this? I don't see this much diversity among other horners but maybe I'm wrong. Somalis are genetically super close to each other, Habesha and Oromo are more diverse amongst themselves.All of them look Somali. Skin tone doesn't mean much among Somalis. I've seen two fullblood sisters where one is as dark as coal and the other is a medium brown. I've seen a brother who is yellowish with a sister as dark as coal and vice versa. My own mother is a light yellow nowadays whereas I can darken to look like an Canfar nomad in the desert. But what tells you we're all Somali are the facial features. Most Somalis look incredibly similar in that respect, including all of the people you shared.