Nicaraguans and Sonoran boas stay typically under 6'. Males usually 4-5 feet. However, they do tend to have a nippy attitude. Nic's especially. My sonoran boy can be very hissy at times, and other times mellow.

My sonoran is still a youngin'.. so I'm hoping he becomes more docile with age and handling. He hasn't tried to bite me yet, however. Just hisses like crazy.