Well, I've had mine for over a month now and he's just a three month old baby... he's always been very laid back, though I've not handled him too much. This past two days, he's been nervous and jumpy, yesterday he struck at me with his mouth closed and today I held him a few minutes and he did not try to strike, but he was quite nervous and tried to go back to his enclosure the whole time... I guess he was not in the mood =)