This is the female White-faced Saki, also known as Guianan saki or Golden-faced Saki. When looking at her you won't find any White-faced or Golden-faced on her, it is referred to the male. But like all wild animals in the jungle, they are unpredictable. You never know what to expect from them, just be prepared for anything. In this case, I wasn't really prepared as I accidentally cut out her tail.