gecko

I've never seen this guy.  I hear him at night.  He's up above my ceiling somewhere.  He does this about every 40 minutes through the night.  He starts with an introductory tapping, and then he says gecko eight or nine times.  At least some people think it sounds like he's saying "gek koooo".  One night it sounded to me like he was sneezing, "a chooo".  Mostly though it sounds to me like a Donald Duck version of "fuk youuu".