I recently returned to the game after a long break (just after extinction release) because a friend rented a server and got a few other friends playing again. One of the guys spotted a Unicorn and decided to take it back to his base for taming, He's built in the cave under the lighthouse with nothing to stop it from running right off of his platforms, which it did, and he got to take all kinds of friendly harassment for letting it drown. After that I figured I'd not see another pop up for a while but I was in the highlands building a wyvern trap and see something bright white running along the edge of the scar. Not only did I spot my first unicorn, but a lvl 135 so it would even be usable. So I took a break from the trap building and swooped it away from all the bugs at the scar and got it tamed up. 2 days later I'm finishing up the wyvern trap and fly off to grind out the last few pieces needed and what do I see? Another Unicorn!! This time it's a 150!! Trap got put on hold again to complete my breeding pair of high level unicorns. After not seeing any in several hundred hours of game play I was pretty stoked.
Since then I've spotted 2 more, so I'm guessing they are not as rare anymore?
