If you’ve been around for a while you may have noticed that the medieval way is to pick one, or possibly two, activities for each animal, and make sure those activities are in every picture. So tigers stare in mirrors, griffins delicately cradle their prey, and the ibix… falls on its head.
This is actually something it does on purpose, as its primary defense mechanism. Its horns are strong enough for it to land unharmed even after jumping off the highest mountains.