Well, that's the thing - when I first found him, he was doing the little tail wiggle (even if nothing happened :p) so I figured he was a he. But he hasn't done any of that since bringing him inside. We first found him in late June or early July, and figured he was probably born around May, possibly April. So he'd be 6-7 months old now. But I've heard it can take up to a year for them to "show", so - who knows?