Everybody knows, some dinosaurs were BIG!How big?Seismosourus was longer than four school buses parked end to end. Brachiosaurus weighed as much as sixteen elephants.But not all dinosaurs were big. Coelophysis probably didn't weigh any more than you. Compsognathus was so small, you could have carried one in your arms. And all dinosaurs -- even the ones who grew up to be gigantic -- began life as tiny babies.Find out just how big and just how small dinosaurs were.