Thanks to science, we now know how pigs are feeling. Researchers programmed an algorithm with pig noises from positive and negative situations. But why? Pigs are one of the smartest animals on Earth.

Add Yahoo as a preferred source to see more of our stories on Google. Some sounds are negative and others positive, the experts say (Getty Images) Pigs are noisy creatures, from their contented oinks ...

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.

There's also something called reverse sneezing. It sounds scary but it's usually fine. What happens is something irritates their throat, they start sucking air in really fast, and that results in this ...