Henry Eliot Howard, The British Warblers A History with Problems of Their Lives…
“ As many as eight or nine collect together, some adult, some immature, the adults apparently very angry, scolding vigorously, their feathers ruffled and their tails spread out; the onlookers also join in the scolding, the commotion being quite unusual for bird-life. So absorbed have they sometimes been that I have crept into the middle of them before they have noticed me, when they have reluctantly dispersed. I once found an empty nest from which the young may have been taken, but there were no dead bodies round it to show that a tragedy had occurred ”
