Guinea pigs are popular pets for good reason - they’re social, expressive, and surprisingly vocal. If you've ever stopped to wonder what all those squeals, purrs, and clicks mean, you're not alone.

STORY: Do these pigs sound happy or sad? European scientists have developed an artificial intelligence algorithm capable of finding out. Their goal is to create a tool that can decode pigs' calls and ...

Guinea pigs don’t wag tails or lick faces the way dogs might, but they still show affection in surprisingly personal ways.