Since I didn't see an edit button... as far as I know the Monkey DOES have peek, but it does not detect hidden nor can it hide. In the wiki, it says it can't peek, but I don't remember that being the case at all when I had it unless it was changed within the last year.
Also, the Homonculous does NOT detect hidden, it only detects the invisible and magical.
Those were the only two I really paid any attention to (for some reason).
EXB