16 April 2021
Vol 372, Issue 6539

About The Cover

Cover image expansion

COVER Tyrannosaurus rex prowl a Cretaceous coast. By using the rich fossil record of T. rex, including its body mass, growth and survivorship curves, geographic range, and geologic longevity, together with the relationship between population density and body mass among living animals, it is possible to ascertain how many T. rex ever roamed the planet and to estimate the fossil recovery rate for this species. See page 284.
Illustration: Julius Csotonyi