Sweden Is Using Clever Crows To Clean Up Litter Around the City
It's no secret that crows are clever. Like other members of the corvid family, crows live in communities known as roosts and are known to scavenge their food. Researchers are fascinated by the birds—even discovering that they can understand the concept of zero. A Swedish entrepreneur named Christian Günther-Hanssen, founder of Corvid Cleaning, is harnessing this avian brilliance to save his city money.