Two shiny rats in cages with dividing wall (IMAGE)

University of Göttingen

Two shiny rats in cages with dividing wall

Caption

One rat (on the right) provides help by pulling the platform so the other one (on the left) can reach the treat (an oat flake in this case). The pulling rat does not get any immediate benefit from helping - she can only hope to get a favour in return later.

Credit

Michael Taborsky

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