Billions of Tyrannosaurus rex roamed North America during their fascinating reign as top predators, according to a team of researchers that went about the daunting task of making the calculation.
원문출처 : https://www.cnn.com/2021/04/15/world/t-rex-billions-intl-scli-scn/index.html
원문출처 : https://www.cnn.com/2021/04/15/world/t-rex-billions-intl-scli-scn/index.html