“Previous research in cotton-top tamarins had shown that the animals can understand basic grammar, for instance, identifying which words logically follow other words in a sentence…While that study suggested monkeys were deaf to complex communication, the new research shows that tamarins can grasp at least one advanced concept: prefixes and suffixes.”
Read the full story at National Geographic. Oh, and by the way, monkeys already have thumbs and can subtract. So, yeah, we’re screwed.