Our neighbours leave their bathroom window open day and night even when they are at work. The local cats take advantage of this and they jump onto the side roof and up into the window. George here has seen the local black cat on the roof and all hell let’s loose with him barking! Every morning is the same setting barky boy off!
I always think it’s rather dangerous leaving a window open when you are not at home. They might get visitors other than the local cats!