Thanks! I grew up with the notion of classical unicorns with their cloven hooves, so I've made an aesthetic choice here -- I'm well aware of the anatomical structure of a horse's hoof. In my headcanon, unicorns (and alicorns) have grooved hoof walls, but not actual cloven hooves. I'm still toying with the idea of actual cloven hooves of some kind for unicorns, though I doubt I'll go down that route.