How many T. rexes roamed Earth?
Scientists say they believe a total of 2.5 billion Tyrannosaurus rexes existed during their reign. The species roamed North America for about 1.2 million to 3.6 million years.
Scientists say they believe a total of 2.5 billion Tyrannosaurus rexes existed during their reign. The species roamed North America for about 1.2 million to 3.6 million years.