Mine is only nippy in his cage, if I reach in there I will get bit, once he is out no issues, he is very calm. I have noticed mine will go through mood swings too depending on the time of the year. As Lefty said Antaresia is a lot of fun to work with and tends to be under rated. I love mine, you get the attitude/personality of a big snake in a really compact package, and if you provide them with a large cage they will be very active; and IMO make a nice display animal. Mine is constantly on the move, perches up on his branches and every time I put fresh water in his bowl he goes straight for it. I put a branch right over his water bowl so he will climb up and then drop his head down towards it.