I checked on him just before I went to bed and he was on the bottom again, naughty thing. Yeah I'm pretty sure he is a boy, he was the first to get dark arms, although I will check again today I case I got that wrong. When I say his claws are clamped, I mean a lot of the time his toes are clamped together, rather than spread out nice and wide. I've just woken up, so I'll be checking on him very shortly and will post again then. Thank you xx