Kaveman Kirk(s), formally known as Homo Kirkus, is a species of ancient humans who existed in Timeline Beta. They are very similar to the sucessful species of human across the multiverse, Homo Sapien(s). All of their remains were found in America.
Differences between the two species obviously start with appearence. All male members of the species would have looked very similar to Charlie Kirk, and all female members would have looked very similar to Erika Kirk. Homo Kirkusi were also hypothosized to have debating in their nature, as samples suggest that they developed true speech much faster than their brethern and many believe that they may be linked to Timeline Beta's nature of having many variants of Charlie.
As mentioned above, many link this species to why there are so many Charlie Kirk variants within Timeline Beta. Some claim that this species was just a normal human species who were quickly infected with kirkification due to a natural deposit of Kirk Energy. Other, more radical people claim that this species never went exist and has lived along the Homo Sapiens the entire time in Beta. Though, the leading theory just suggests that Sapiens and Kirkusi often had offspring who had dominant, kirkified genes.