During the past few days one male Dunnock (Prunella modularis) has been announcing his territorial ownership by singing from the highest perch he could find in a conifer situated in a neighbours garden.
Similar in size to our Robin with a warbler-like bill he loudly projected his even pitch, shuttling song, (sometimes said to be like a squeaking gate or trolley wheels) and was constantly answered by another male calling from a much taller conifer 100 yards away.
A flutter of his wings as he repositioned himself.
He then took up a stationery pose once his opponent stopped singing. Generally a quiet, unobtrusive bird that is often overlooked as it skulks through the undergrowth and belies its spicy sex life which I won't recount here but you can check out a piece I posted a year ago for more detail, if you are interested. FAB.