Alfred Newton, 1911 Encyclopædia Britannica, Volume 19… (1911)
“ The nestling plumage of the nightingale differs much from that of the adult, the feathers above being tipped with a buff spot, just as in the young of the redbreast, hedge-sparrow and redstart, thereby showing the natural affinity of all these forms. Towards the end of summer the nightingale disappears to its African winter haunts. ”
