First dinosaurs walked on four legs

Friday, November 26, 2010

The first dinosaurs were extremely small animals and they walked on four legs. They would have probably came to rule the world after a mass extinction knocked out many big reptiles.

The 250-million-year-old footprints are the oldest evidence of dinosaurs. Reports say that the animal was about the size of a small domestic cat and would have lived near rivers where larger crocodilians thrived.

Fossils indicate that a mass extinction occurred when an asteroid or volcanic event drove the dinosaurs into extinction and allowed mammals to thrive.

The new footprints only slightly postdate the greatest mass extinction of all time suggesting that the origin of dinosaurs occurred in the immediate aftermath of this catastrophe.

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