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Between the size of the room and the cages, the men weren't fast enough to catch the monkeys. The small monkeys in question were meant to live in the trees and could leap long distances. Whenever the men would get close, the monkey would leap to the other side of the room. There were too many ways for the monkey to get away, and too many things to hide behind. The environment favored the monkey, not the doctors who were there to catch it.
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