What are the differences between dinosaurs and human beings?

'Dinosaur' refers to any member of the class Dinosauria, whereas 'human' refers to any member of the genus Homo. Thus there are many different species of dinosaurs but only a handful of humans. Additionally, dinosaurs typically had feathers and/or scales (like birds), whereas humans have fur. Dinosaurs also existed for a duration of at least 100 million years, and a geological era, approximately 100 times as long as humans. Dinosaurs also were reduced to the theropod branch of the formerly large evolutionary tree approximnately 75 million years ago, and now exist as the class Aves.