Dinosaurs became giants — so why did they never become tiny?
A new study suggests that dinosaurs did not evolve to be tiny because they were outcompeted by early small mammals for ecological niches. This research highlights how inter-species competition may have imposed a lower size limit on dinosaur evolution.
Why it matters
It offers a compelling evolutionary explanation for the size disparity between dinosaurs and modern vertebrates, deepening our understanding of prehistoric ecosystems.
Dinosaurs are often remembered for their enormous size. Tyrannosaurus rex was an imposing predator, while dinosaurs such as Apatosaurus reached truly massive proportions. Yet new research suggests that one of the most intriguing questions about dinosaur evolution lies at the opposite end of the size spectrum: Why did dinosaurs apparently never become extremely small?
In a study published in the journal Evolution , researchers from the American Museum of Natural History and Princeton University used mathematical models to examine how body size evolved among vertebrates. Their results show that energy use and physiology can account for the range of sizes seen in mammals, birds, and turtles. Those same factors, however, cannot explain why even the smallest dinosaurs other than birds remained relatively large.
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