How would gorillas notice evolution? And why would they? As far as you know, how long have gorillas been gorillas. How long have humans been humans? Would a gorilla be able to tell you? Is it capable of telling you, or would you say, as some may, you don't know? Maybe a person might think a gorilla knows how to write but doesn't want to. You think that's possible?
Because if a person says (as someone might), 'anything is possible...,' 'we don't know,' etc., it's time to go on a late night talk show.