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. 2015 Apr 16;5:9622. doi: 10.1038/srep09622

Figure 3. Cotton-top tamarins during the group service experiment.

Figure 3

The individual on the right hand side pulls the board closer to the wire-mesh grid of their home cage, which brings the transparent food bowl with the food reward on top of the board within reach of its group members. The pulling individual can not at the same time take the food for itself because the food is too far away and the board draws back as soon as the handle is released. Photo by JB.