9. No one knows how Triceratops used its horns.
For generations, paleontologists assumed that Triceratops evolved its horns for one reason–to keep hungry raptors and tyrannosaurs at bay. Now, though, some experts believe these horns may have been primarily a sexually selected characteristic: that is, male Triceratops with bigger, sharper horns had a better chance of mating with available females.
Aw yeah, baby. Check out my horns.