Ravens detect cheaters in cooperation
Date:October 7, 2015
Source:University of Vienna
Several recent studies have already revealed that ravens are among the most intelligent species of birds and even species in general. The cognitive biologists from the University of Vienna now add cooperation the ravens' already impressive resume. "From the wild, it was already known that ravens are able to cooperate when, for example, mobbing predators. But using an experimental set-up working with captive ravens now allowed us to investigate, how exactly they do so," says lead-author Jorg Massen.
In the experiment two ravens had to simultaneously pull the two ends of one rope to slide a platform with two pieces of cheese into reach. If, however, only one individual would pull, the rope would slip through the loops on the platform and the birds were left with the rope and without cheese. Without any training the ravens spontaneously solved this task and cooperated successfully. However, it turned out that they didn't do equally well with everybody, and that they rather work together with friends than with enemies.