[AlbertoGP]

Oh, wow... I followed the link to the other article where they describe how they came up with such a figure:

> “For instance, the T. rex population was likely about 20,000 at any one time, but the 95% confidence range — the range of numbers in which there's a 95% chance the true number falls — is 1,300 to 328,000. In other words, when the T. rex total is calculated (which includes population density, population size at any one time, generation time and total number of generations), the number of T. rex individuals that ever lived could be anywhere from 140 million to 42 billion, the researchers said.”

> — https://www.livescience.com/number-of-tyrannosaurus-rex-on-e...