When early humans appears on earth, dinosaurs had already been dead for millions of years. We know dinosaurs existed from fossils.
Fossils are the hardened remains of plants or animals that lived long ago.
Dinosaur fossils have been found everywhere on earth. A dinosaur gets its name from something special about the way it lived, its body, or the place where it was found. Scientists don't exactly know what color dinosaurs were. Some think the region they lived in affected their color. Others think they were the same color as reptiles today.