Why Small Dinosaurs Were Rare: Mammals May Have Been the Reason
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Dinosaurs emerged approximately 230 million years ago and went on to dominate land ecosystems across Earth. They maintained this dominance for tens of millions of years before a mass extinction event ended their reign. An asteroid impact 66 million years ago is widely recognized as the trigger for this catastrophic die-off. Researchers have been examining why very small-bodied dinosaurs were notably absent, despite the group's enormous diversity. Mammals are now being considered as a possible factor that may have prevented tiny dinosaurs from establishing themselves in smaller size niches.
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