Rock Doc

We live in a time in which most animals are relatively small. If you think back to your exposure to the Ice Age, perhaps in elementary school, you may remember big mammals like the mastodon and the saber tooth tiger. Less famous but equally big was a deer the size of a modern elk and a beaver the size of a black bear. In sum, our ancestors – the people alive in the Ice Age – were small compared to a number of the animals around them.

Dinosaurs are also famously large. How dinosaurs grew to be as large as they did has always been a bit of a mystery. Now a new fossil discovery in Yunnan Province...