My chameleon, Milo is very angry at me. When I try to pick him up he hisses and tries to hit his head on my hand. I've tried everything for him, hand feeding, cup feeding, going from under or from the side and even just plain leaving him to atleat try and climb onto my hand. I think hes just aggressive to me, my sister could easily pick him up without him being violent or anything but when I do it he instantly hisses and tries to bite, any help on that? I'd be nice to hold him atleast once and get to know him.