How often does it happen to you to bump your head against a hard surface? If it happens at least occasionally, you know very well how painful it can be, apart from being potentially dangerous. However, there was a dinosaur species that evolved to use their heads as powerful defense weapons – Pachycephalosaurus.
It is worth noting that some theories suggest that this species used its thickened skull to attract mates instead of defense. In any case, this feature makes it one of the most distinct dinosaur species out there. Below is the Pachycephalosaurus quiz; try it out to test your knowledge!