Dogs have evolved to be friendly and tolerant of humans and one another, which might suggest they would be good at cooperative tasks.

Wolves are known to cooperate in hunting and even in raising one another’s pups, but they can seem pretty intolerant of one another when they are snapping and growling around a kill.

So researchers at the Wolf Science Center at the University of Vienna decided to compare the performance of wolves and dogs on a classic behavioral test.

To get a food treat, two animals have to pull ropes attached to different ends of a tray. The trick is that they have to pull both ropes at the same time. Chimps, parrots, rooks and elephants have all succeeded at the task.