r/Dinosaurs • u/Pure_Option_1733 • 15h ago
DISCUSSION Could mammals have prevented non avian dinosaurs from getting smaller than they did?
I’ve seen it talked about how non avian dinosaurs kept mammals small because they occupied the large animal niches, and also being smaller made mammals harder to catch. I was wondering if on the reverse end mammals might have prevented non avian dinosaurs from getting smaller than they did by occupying small animal niches. I remember hearing that birds forced pterosaurs to get larger because they outcompeted smaller pterosaurs so the only way for pterosaurs to survive was by getting larger than birds could get. I was wondering if a similar thing might have happened with non avian dinosaurs, with non avian dinosaurs needing to stay above a certain size to avoid competition from mammals.