Monkey

Back in the day half the stuff they did would be very illegal today. Not saying that today things are any better , but cruel treatment of animals was almost accepted back in the day. Even though the experiment did show some valuable information it shouldn't have been achieved in that way. They could have done so many other things to get the same results with a different approach. After experiments like this it left monkeys traumatized and scared. For the record now a days experiments should not even come close to this.