It's not just primates. Dogs and cats can 'speak' too.

A UCSD researcher has spent years studying the language acquisition of cats and dogs in 47 countries. You may have seen some of his research on TikTok where animals learn to hit buttons that play words like "outside," "food" and "treats." But are the animals really talking to us, or do they just see us a treat machines? The World's Marco Werman gets to the bottom of things.