From someone in the ars comments: The 4th and the last image are fair matches to form and wall height of desert hunting kites of Central Asia seen here: https:

From someone in the ars comments: The 4th and the last image are fair matches to form and wall height of desert hunting kites of Central Asia seen here: https://news.nationalgeographic.com/2016/08/desert-kites-out-of-eden-walk-uzbekistan-iron-age-saiga/ https://news.nationalgeographic.com/2016/08/desert-kites-out... See especially this image: https://news.nationalgeographic.com/content/dam/news/rights-exempt/nat-geo-staff-graphics-illustrations/2016/08/desert_kites/Kite_traps04-Artboard_2.ngsversion.1470860356983.png https://news.nationalgeographic.com/content/dam/news/rights-... From the linked article (on nationalgeographic): “They make more sense when looked at from above,” says Shamil Amirov, an archaeologist who uses satellite imagery to map the colossal artifacts in western Uzbekistan. “Most are shaped like arrows. We have found them in chains across the migration trails of antelopes. They probably directed thousands of animals into killing pits.” In effect, Amirov says, Central Asia’s desert kites—named after similar triangular or kite-shaped features discovered earlier in the Middle East—were massive protein pumps. Built over generations by nomadic pastoralists some 2,500 years ago, the structures siphoned vast numbers of animals from the environment. ... Desert kites first came to the attention of science nearly a century ago, when World War I pilots reported low walls tracing gigantic polygons, funnels, and triangles across the sunbaked barrens of modern Jordan, Israel, Syria, and Saudi Arabia. Experts have been debating the function of these cryptic structures ever since.