Now the funny thing is that Sarah Brosnan, who's been doing this with chimpanzees, had a couple of combinations of chimpanzees where, indeed, the one who would get the grape would refuse the grape until the other guy also got a grape.
Det roliga är att Sarah Brosnan, som gjort detta med schimpanser, hade några schimpanspar, där faktiskt den som fick druvor,  vägrade ta emot druvorna tills den andra också fick druvor.