Ok, I'll bite on this obvious one. As someone higher in the thread posted "make a bird sterile, and it will still build a nest" is a perfect example of a behavior that isn't cogent. Does this monkey still throw a hail storm of rocks at nothing on days the zoo is closed? This monkey is cogent.
"Let's ask: On a scale measuring what exactly, with what defined points, is a chimp's behavior doing what exactly on what position, related to that of a bird or spider doing what exactly?"
Research like this is what will allow us to precisely define such a scale, give it time but don't decry research that is obviously working towards an answer that you seek.