The Unicorn has little to fear in our world, but of the few predators they have, they need to be careful.
The largest predator of the Unicorn is the Pegasus. The Unicorn and the Pegasus were commonly mistaken for the same species, which caused conflict between the two, since they didn't see the similiarities. The Pegasus breed began ruthlessly attacking Unicorns, to prove they were the better species. This caused many Unicorn-Pegasus wars in the past, and they've feared eachother for centuries.
Unicorns are also deadly afraid of lions. Lion Pride's have hunted to near exstinction the existence of Unicorns in the South. Lions love Unicorn blood, it makes them stronger. Unicorns are useless when a Lion attacks, because they cannot attack any species belonging to the cat family. Because cats are awesome, and the Unicorns know this. This leed to thousands are Unicorns being helplessly slaughtered for food.
