Caterwaul

Or more accurately, the cat fight for the wall!

The grey cat is a neighbours', the big fluffy black one is a stranger, and he was on the wall where the grey one usually resides (and annoys Bert). But what a noise these two were making, they sounded like a baby crying and it went on for ages. Stalking each other in slow motion and staring each other out. They only stopped temporarily when they saw me at the window with my camera.