Earth was home to billions of T-rex over lakhs of generations, suggests new study

The estimate comes from studies of well-preserved T rex fossils – 32 of them, with enough material to determine they were adults.

from http://www.firstpost.com/tech/science/earth-was-home-to-billions-of-t-rex-over-lakhs-of-generations-suggests-new-study-9535601.html