According to Google, he/she is a baby blackbird. Makes sense, since dad was on the telegraph pole calling him and mum was doing an impression of a miniature Velociraptor to scare our old cat off at ground level. You know head down, beak on point. Our moggy took the hint and wandered back off. She's at least 20, so live and let live. "Rainbow" (next door's 2 year old tom, named because he's black and white..) wasn't about.
When our cat's sister was alive, they would gang up on other cats or dogs on their patch if they didn't like the look of them. Oki in full view at 12 O'Clock head down, ears down, walking very slowly towards the 'prey'. Meanwhile, Mia (the one we still have) would be a lot less visible coming in at 3 or 9 O'clock in stealth mode. If dog or cat faced up to Oki by fluffing up or woofing, Mia would then make her presence known at a slow trot from the side. If said animal didn't run at that point, Oki would give it the full on hunting leopard style from the front, followed by the other one. They knew not to try this on skinny leg dogs or other ones staring with ears down. Most dog owners had started crossing the road when they could see fido was getting anxious.