When one sees a monkey  for the first time one should make the bracha of Meshaneh HaBriyot. However, if one sees another monkey  one cannot make the bracha again with Shem UMalchut; however, if it has been 30 days one can make the bracha without Shem UMalchut.

I have seen many monkeys  in my travels. The most memorable was in the Monkey Temple in Bali Indonesia where I had monkeys climbing all over me.