I’m not sure whether this male Wren’s posturing was a threat display – ‘This is my territory. Enter at your own risk!’ – or whether he was trying to impress the other Wren that was dotting about in the tree nearby – ‘Look at me! I’m a big healthy tough male and I’d make a good mate.’ He sure was giving it his all though – it always amazes me how much sound can be produced by such a small bird.