Why Dinosaurs Never Shrank to the Size of a Mouse!

Giant dinosaurs ruled the Earth for millions of years, but scientists just discovered why we never found any tiny, hamster-sized dinosaurs running around. It turns out that fluffy little mammal ancestors took all the best hiding spots and food, keeping the dinosaurs from ever shrinking down. Imagine a T-Rex the size of a teacup trying to compete with a sneaky prehistoric mouse!