The Tyrannosaurus rex is dinosaur royalty, an iconic and instantly identifiable species – and according to a new study, as many as 1.7 billion of these beasts roamed Earth before an unfortunate meeting with an asteroid.
on these factors based on detailed fossil studies and comparisons with modern-day species that scientists think have kept certain dinosaur traits.
Griebeler tested her model against data on 23 different extant species among reptiles, birds, and mammals and found that it predicted population numbers pretty well compared to the previous model. That suggests it should work for theThe good news is that one of the authors behind the 2021 estimate, University of California, Berkeley, paleontologist Charles Marshall, approves of the new work: he toldAs well as reaching that hefty 1.
Griebeler suggests that her model – which focuses on maximum lifespan, sexual maturation age, and maximum annual offspring numbers – can also help estimate population numbers for other extinct species. "All of these shortcomings of the previous model favor the assessment of individual and population characteristics of
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