science π¦ Why were there no mouse-sized dinosaurs?
New research suggests early mammals might have blocked the evolution of tiny dinosaurs. Scientists used mathematical models to study body size evolution across vertebrates. This finding was published in the journal Evolution, noting that small mammals filled available ecological niches. Small-bodied early mammals likely outcompeted dinosaurs, preventing them from evolving into smaller sizes. This dynamic only shifted after the asteroid impact 66 million years ago. π¦