In this video they briefly show an experiment where they have 2 monkeys preform a task (give the handler a rock) and they will be rewarded.
Well the monkey on the left only gets rewarded with a cucumber for a treat, whereas the monkey on the right receives a grape for giving the handler a
rock. So the monkey on the left catches on to this, and starts getting angry when he is given a cucumber every time he hands the guy a rock.
Eventually, the monkey on the left has had it with this, and he throws his cucumber pieces at the handler and he's jumping up and down fuming that the
other monkey was getting the better treat for doing the same task.
for best results watch 0:00 - 1:52 (unless you want to listen to them talk about what you just saw for another 3 minutes)
Pretty amazing that the monkey caught on pretty quick that he was getting the short end of the stick with the rewards
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