Figure 3From: Reciprocal cooperation between unrelated rats depends on cost to donor and benefit to recipientNumber of pulls in dependence of the weight of the social partner. (A) The number of pulls of focal rats for a hungry partner decreased with increasing weight of the experimental partner (p = 0.013). (B) In contrast, rats pulled for satiated partners more often when these were heavier (p = 0.013; two overlapping points were slightly shifted to make them visible in the graph); n = 14 for both treatments.Back to article page