Study Estimates 2.5 Billion T. Rex Roamed Earth Over Time - Nerdist
- Study Estimates 2.5 Billion T. Rex Roamed Earth Over Time Nerdist
- How many _Tyrannosaurus rex_ walked the Earth? The Conversation US
- As many as 2.5 billion Tyrannosaurus rexes once stalked Earth Livescience.com
- How many T. rexes were there? Billions. UC Berkeley
- All-time T. rex population was 2.5 billion, new study estimates New York Daily News
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