Why Were There No Tiny Dinosaurs? Mammals May Be to Blame

The fossil record presents a curious puzzle: the absence of exceptionally tiny dinosaurs. While paleontologists have unearthed a vast array of dinosaur species, ranging from the colossal to the moderately sized, the smallest known dinosaurs were still quite substantial compared to many modern animals. Now, new research proposes a compelling explanation for this evolutionary gap, pointing fingers at our own ancient ancestors: mammals.

The prevailing theory suggests that early mammals, driven by their own survival needs, may have actively suppressed the proliferation of small dinosaur species. These opportunistic mammals likely preyed on dinosaur eggs and newly hatched young. By consistently targeting the smallest and most vulnerable dinosaurs, mammals could have effectively prevented these smaller lineages from establishing themselves and diversifying. This ecological pressure would have favored larger dinosaur species that were less susceptible to mammalian predation.