What's that sticking out of your thorax?

Nigel Stork said more or less that to a first approximation we are all insects. It might be further said that to a second we are all monkeys* and to a third we are all Africans. The rest is meaningless detail; but it is the detail that seems to matter. It is probably the ability to be obsessed with such details that makes us human. Then again, possibly not.

*Yes, I know, but it sounds better than catarrhines or hominoidea