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.
Not much. They are better behaved than humans.
About one or two percent difference in D.N.A