I do have ears and can hear reasonably well, am familiar with most knocking sounds I hear in the woods. Am I required to have a Ph. D. in order to listen?
You're the one who made the claim that no one could confuse woodpecker/bird knocks with primate knocks thus implying that you have experience with primate knocks.
I simply asked you to confirm that given that I myself have never heard a primate knock.