User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-74.193.207.108-20120916201206/@comment-1758220-20120917195422

What I always suspected was that the Ceadeus is an air breather like whales. When they're still young, they have small horns and completely unobstructed eyes because they live closer to the surface due to the lower lung capacity. However as it grows older, its body is wired to grow the horns out over its eyes, as the larger the lung capacity, the deeper it lives, the less light there is, the less need it has for eyes.