Okay kiddo, have you ever heard of horses? Titanotylopus is like a really big horse that used to live a long, long time ago. But it's not exactly like a horse, it's actually related to them but bigger and different in some ways.
First of all, it was about as tall as a giraffe! Imagine a horse that big, pretty cool huh? And it had four long legs to support all that weight. Its body was covered in fur, kind of like a big soft carpet.
But here's the really interesting part - Titanotylopus had two big bumps on his head that looked like horns. But these weren't really horns, they were actually made of bone and were used for fighting. When two Titanotylopus wanted to show off to each other or fight for territory or a mate, they would bump and smash their heads together!
Now, there's one more thing you need to know. Titanotylopus only lived in one place in the world, North America. And they only lived there a really long time ago, before even your great-great-great-great-grandparents were born.
So there you have it, Titanotylopus was like a giant furry horse with bony head bumps that lived a long time ago in North America. Pretty amazing, right?!