European researchers are developing a tool to help identify animal emotions through a vocal recognition system. It aims to help people who work with pigs identify whether the animals are in distress.

Guinea pigs are small animals with big opinions, and squeaks are the fastest way they share them. These sounds typically begin early, often within two weeks of birth, and continue throughout the day.

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.

In recent years, Alex, the African gray parrot, developed a vocabulary of 150 words. PEPPERBERG: That's a good boy. Truck - good boy. ALEX: Want nut. PEPPERBERG: Well, you can have a nut. Go choose ...