Hello, I have recently moved to a new area and encountered some very strange cat sounds! I have 4 of my own female cats, and have moved onto a street with several male cats. Two of them, which look so similar they could be related are displaying some odd behaviour. They sit opposite eachother but very close for very long periods of time and miaow at eachother but with such astrange sound-the best way I can describe it is that it sounds like two high pitched slurred voices talking. They also shake their jaws at eachother and no sound comes out. This happens until they eventually attack eachother, then they separate and start the process again! Is this some kind of territorial/mating behaviour? Has anyone had any experience of this? The two cats are vey violent to eachother, but the strange sound that they both make is what suprises me the most!