A 18' fence
Monkeys have tails. We are most closely related to Primates: Chimps, Gorillas, Orangatans. We have DNA which is just one jot or 1% off from these three type Great Apes. Ah, but we are animals. Look this up, if you think I have it wrong. I may indeed have my ideas wrong, but it is what I have read. Check with Jane Goodall.
Let's see:<br />
More highly developed pre-frontal cortex in our brains.<br />
Monkeys evolved to dwell in trees, whereas humans evolved for living on the ground -- changed our hip configuration, gave us flatter feet (no longer needed in trees from the time of our common ancestor with other apes an eventual monkeys).<br />
We lost the tail that was on our most recent common ancestor between hominids and the group of animals that evolved into monkeys -- most likely because of hominids being ground dwellers as opposed to needing an extra appendage to dwell in trees.<br />
A change in the configuration of the mouth, tongue and vocal tracts that led to eventual speech in humans.<br />
etc., etc., etc., <br />
Hope this helps.<br />
fear of injury
Not much. They are better behaved than humans.
About one or two percent difference in D.N.A