unicorn speculation

Unicorns are very clearly herd-animal-type ungulates, but usually depicted as solitary. They are also famously elusive and easy to lose track of despite being stark white. I propose that unicorns are herd animals, and the majority are not pure white; rather, albinism and leucicism occur in unicorns as in everything else, and only these unicorns ever get spotted because a properly camouflaged unicorn is even more impossible to spot and track.

This goes slightly against the "unicorns are a type of monster and should be treated as such, dammit" reasoning I usually prefer, since it assumes unicorns are prey animals that make biological sense, but I like the idea that for every unicorn you actually see there are two to eight nearby that you miss entirely.