Having been born on earth, I grew up among you humans. Only later, after about six rotations of your sun around your planet, have I become aware that I am not one of you. That I might be of a different kind. A Fnool.
In fact, I have never seen another Fnool, so at best my identification as one is an educated – one should hope – guess. But I’m definitely not human, and I know of no other options.
The cheese composing your planet’s only moon may rot before I’ll know for sure.