We call them The Twins. They were only six or seven months old when we first saw them, beautiful, lively, and curious.  They first appeared just after dark last August at our kitchen window while we were doing the dishes and they watched us for about a minute before moving on.  Then they climbed up to our second-floor deck and we heard them overhead rearranging the furniture.  The next morning we found they had chewed on the seat cushions and shredded plastic insulation. We saw them again at the window on several other evenings around the same time, soon followed by their cacaphony of deck noises.  We always enjoy their return visits!