Humans

Humans (placeholder, what isn't a placeholder at this point tho] are among the most plentiful species in the Isles. Calling them humans is a little inaccurate. They are descended from modern-day humans, with the "slight" addition of animal traits.

History says that the First Guardians imposed these traits onto humans, possibly as a way to help them survive in this new earth.

These animal attributes seem to be magical in nature rather than genetic, as mixing and matching isn't really an issue--one parent's trait will get passed on, seemingly randomly.

100% Humans
Not everyone has animal traits. Some humans remain who completely lack animal traits, and generally lack magic with them. These are assumed to be the descendants of those who survived the Great Chasm without the help of Guardians.