*latches onto the factoid to remain sane* None of the Panthera cat family can purr. Their vocal cords aren't built for it and the family includes lions, tigers, jaguars, and leopards. I believe the "happy big cat noise" is called chuffing. Felidae can purr and that encompasses the cheetahs, snow leopards, clouded leopards, and pumas. I can personally attest to cheetahs purring exactly like a housecat.

The more you know! Thanks for this. I love learning new stuff. I knew that SOME of the big cats could purr. But yeah, I knew that tigers made chuffing noises when they're happy. (That is what it's called, yes.)