Cat on top

I am not sure if my kitties want to fly with the bird to the roof or what, but I have seen them so many times climbing, walking, and relaxing on the roof of our neighbors house. The first time I saw one of my kitties on the roof, it was Fluffy, I rang our neighbors door. It was at mid-night. I was hoping that he would let me climb up to his roof to save my Fluffy. This is all new for me, as Mini and Fluffy are my first kitties. Whatever they do is so interesting to me. Cat on top are kind of a daily thing for Mini and fluffy.