That's right! While the human skull is roomy enough for a big brain and large eyes, this Monoclonius skull shows a very different survival strategy.

Monoclonius relied on a long, sharp horn and a thick, bony plate to protect its head from hungry predators. It's tiny brain was the size of a quart jar.

.
...both dinosaurs and humans have tailbones-dinosaurs just have tails attached to theirs! What do both humans and dinosaurs use their tailbones for?