These monkeys have been trained to pick up a stone from the tray attached to their cages, and give it to the lab technician.
In exchange the lab tech will give them a piece of fruit.
The monkey on the left is given a piece of cucumber, and he is fine with it.
THEN...the monkey on the right is given a grape.
Watch the reaction of the monkey on the left when he gives the lab tech a rock hoping he gets a grape also....
In exchange the lab tech will give them a piece of fruit.
The monkey on the left is given a piece of cucumber, and he is fine with it.
THEN...the monkey on the right is given a grape.
Watch the reaction of the monkey on the left when he gives the lab tech a rock hoping he gets a grape also....
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