Teen angst? T-Rex, other large dinosaurs out-competed smaller rival species, study finds

Dinosaurs were not particularly diverse: there are only some 1,500 known species, compared to tens of thousands of modern mammalian and bird species.

from http://www.firstpost.com/tech/science/teen-angst-t-rex-other-large-dinosaurs-out-competed-smaller-rival-species-study-finds-9349051.html