THE AUTUMN SONG OF BIRDS.
In a paper on "The Evolution of Bird-Song" which appeared in 'The Zoologist,' 1890, p. 233, and attracted some criticism, I stated that "in autumn the young male Sky Larks, Thrushes, and Blackbirds begin to sing," and Mr. Aplin supports this statement (Zool. 1894, p. 411), saying that on account of the quality of the autumn songs it seems likely that they are produced by young birds of the year. He had never heard a Blackbird sing the autumn song; nor have I; but I have heard the young Blackbird practising a soft-warbled strain in October, in the manner of a young Thrush.
Mr. Aplin classes the Robin and Starling with the Thrush and Hedgesparrow, as commencing to sing in November, or even in October (Zool. 1894, p. 410); but the two former birds begin their autumn song (if such it be) in August (see Zool. 1890, p. 242, also 'Evolution of Bird-Song' [1896], p. 65), or earlier. I have often observed the Robin recommencing its song during the first week in August; and this year, in Kent, numbers began before the middle of July. The Starling I have observed year by year to recommence in the first week in August.
Mr. Aplin found the Willow Wren silent soon after the middle of June (Zool. 1894, p. 411); and so have I for a week or two; but I have heard numbers in song early in July (in Gloucestershire and in Kent), and this year and last dozens could be heard every morning. I have often seen a Willow Wren sing when in heavy moult. This bird is the most persistent singer of all our summer visitors, not ceasing till the middle of August. The Blackcap I have once heard in September.
I can find no distinction between the spring and autumn songs of these birds, except that the Robin makes great use of
