ocr: Evolution4 organization that depend on elaborate behavioral signaling systems. The earliest potential primates date from around sixty-five million years ago, at the very beginning of the Age of Mammals. They do not closely resemble any primates living today. By about fitty-seven million years ago, primates quite similar to today's lemurs had become well established in the forests of the - northern continents and probably in Africa, too. In the right-hand section of the mural, 8