I had a gecko in my room and my RA never found out.
I liked living in a dorm for the first semester. It was nice to have people to hang out with at the beginning and we got into some hilarious shenanigans. By second semester though, I was pretty tired of all the forced socialization. Nothing irritates me more than someone insisting we hang out or coming over unannounced... and that happens basically daily in a dorm. It was really nice being so close to all of my classes though and dorm parties were pretty wild!