 They found that the apes only recruited a partner (by unlocking a door) if the task required cooperation.When given the choice between partners, the apes chose the more effective one, based on their experience with each of them previously.Suchak, Eppley, Campbell, Feldman, Quarles, and de Waal argued that even when experiments take social relationships into account, the results still do not match the cooperation capabilities observed in the wild.