I don't keep any, but from what I know they stay fairly small (7 ft max I think) and are fairly calm. Everyone that I know that has had them, provides a lot of space (think 2 ft deep 4ft long and 4 ft. high) since they like to stretch and climb. They also need high humidity and hides/climbing branches. They also get fairly thick bodied for an arboreal - similar to a blood python I think.