Pigs are highly intelligent creatures, and a study released on Thursday has revealed that theyre skilled gamers, too.

Published in the journal Frontiers in Psychology , the paper is the culmination of extensive research into pig intelligence that began in the 90s by scientists working with Stanley Curtis, a legendary swine researcher who died in 2010. It was co-authored by Candace Croney, director of Purdue Universitys Center for Animal Welfare Science, and Sarah Boysen, a professor of psychology at Ohio State University renowned for her research into chimpanzees.

The paper highlights two Yorkshire pigs named Hamlet and Omelet, and two Panepinto micro pigs often used in research and usually weighing 50-70 pounds named Ebony and Ivory, all of whom were kept at Pennsylvania State University.

The pigs were trained at a rudimentary joystick-operated video game task that had originally been created to test chimpanzees and rhesus monkeys. They learned how to manipulate a joystick with their snouts to move a computer cursor across a screen. Once they maneuvered the cursor to hit a wall, a treat dispenser connected to the joystick would deliver a snack.