I had something interesting happen, my one cat was pacing around franticly. In watching her I noticed there was a cat outside and she was going from window to window to watch him. I was a little puzzled because this is not anything unusual around here, but she was just frantic, never seen her like this, she was looking at me crying, like to say help me get outside. When I opened the door most of the cats run, this one didn't. When my cat had a litter of kittens several yrs. ago, she had 3 and 2 survived. When the 2 were ready to go I gave them to my vet. for them to finds homes for them and when my cat realized they were gone she went into a deep depression, I almost went and got the kittens back, it was that bad, but the vet said she would get over it. She did, it took a long time, yes for a cat !! Could this boy that was here tonight, be hers ? she has never reacted to any other cat like that, why now ? I am interested in finding something out about this.