Dinosaurs ruled the Earth for ~185 million years, with huge diversity in physical forms and living everywhere from North America to Antarctica. But during that time, from 250 million years ago to 66 million years ago, they most definitely weren't alone: alongside them were monsters the size of giraffes flying through the skies, marine leviathans that could feast on a T. rex, and hidden beasts scampering through all layers of the prehistoric forests. So how do paleontologists classify the differences between dinosaurs and other creatures? Why did these differences evolve in the first place? Are there dinosaurs today? What makes a dinosaur a dinosaur? Come find out and bring any questions you may have about dinosaurs or other prehistoric creatures!