Monkeys also have an "uncanny valley"
The "uncanny valley" is the name given to this phenomenon:
As the likeness to humans increases, reactions grow more positive—until the likeness gets too close, while still not being fully human. At that point, people recoil. This is one reason that successful CGI films use cartoon-like characters rather than trying to portray realistic humans.
What’s interesting is that monkeys have much the same reaction.
