Which dinosaur is found in almost every continent?
During the Mesozoic, the time when dinosaurs existed, the
continents were closer together, and the formation and elimination
of land bridges due to rises and falls in sea level would have
allowed dinosaurs to cross from one continent to another. And,
during the beginning of the Mesozoic, all of the continents were
massed together into the supercontinent Pangaea, so that oceans
would not have formed barriers between continents. Also, some
dinosaurs could swim, and because the seas that separated the
continents were much narrower than they are today, they may have
occasionally been able to cross.