Dinosaurs are not so fierce at all

A new dinosaur species discovered in Arizona suggests that dinosaurs did not spread by overpowering other species, but by taking advantage of a natural catastrophe that wiped out their competitors.

At the end of the Triassic period, one of the five great mass extinction events in Earth's history happened, wiping out many of the potential competitors to dinosaurs. Evidence from Sarahsaurus and two other early sauropodomorphs suggests that each migrated into North America in separate waves long after the extinction and that no such dinosaurs migrated there before the extinction.

We used to think of dinosaurs as fierce creatures that outcompeted other creatures, but its not the case. They were more opportunistic creatures which didn't invade the neighborhood. They waited for the residents to leave and when no one was there they moved in.

Source: http://www.sciencedaily.com/

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