William Henry Mousley, 'The Singing Tree', or How Near to the Nest Do the Male Birds Sing… (1919)
“ Now it must not be imagined that during all those lours I had the male constantly under observation, an impossibility with a warbler, as often when singing he would suddenly cease, cock his head on one side, peer down into the undergrowth, and then suddenly make off, and I knew by this that he had probably observed the female and was after her ”
