Mills

Mills (Captiosus Millensimus) are a hyper-intelligent species of animal that exist in the World. They are the only known surviving intelligent species. The other known intelligent species was the Giants, however they have gone extinct. The intelligence of the Mill species has resulted in the creation of tools, technology, art, and culture. They have mostly relied on Giant Relics as sources of materials and shelter, although this has begun to change in the last few centuries with the advent of cities.

Origin
Despite the numerous creation myths and theories about the origin of Mills, there is no scientifically backed up answer as of yet. They appear to be completely different than all other living species, as there is no trace of them any further back than Year 0, & it is very likely that they didn't appear until then. Further scientific research by Kaitlin Wersley suggests that Giants were alive shortly before Year 0 as well, suggesting a connection between the two events. Assuming that this is true, many historians believe it is safe to assume that some of the information featured in the many Giant Creation Myths are true, although there have been skeptics that claim that such a conclusion is silly.