Your kitty may have the swagger of a mighty jungle cat, but it’s hard to take the tough cat act seriously once it opens its mouth. Unlike their roaring relatives, domestic cats have a high-pitched, mewling cry. However, they do purr—a trait that isn’t shared with lions, tigers, leopards, or jaguars, the four species of cats with loud, growling vocalizations.

In the video below, SciShow’s Hank Green explains the science behind why your beloved ball of fur can’t roar—and how it’s linked to their ferocious cousins' lack of purring ability.