Here's why:
* Domestic cats are not big cats: They are small felines, belonging to the genus *Felis*. Big cats, like pumas, lions, and tigers, belong to the genus *Panthera*.
* Roar vs. purr: Big cats have a specialized bone structure in their larynx that allows them to produce a deep, resonant roar. Domestic cats lack this structure and instead have a very different vocalization – the purr.
* Pumas are powerful roarers: Pumas are known for their loud, piercing roars that can be heard for miles. This roar is a powerful tool for communication, territorial marking, and hunting.
While domestic cats may hiss, meow, or growl, they don't have the physical capacity to roar like a puma.