THE following notes on the length of Sky-Lark (Alauda a, arvensis) song may be of interest in connexion with Mr. W. B. Alexander's interesting record of an 18 minute song (antea, Vol. xxxv, p. 160). The point was made in relation to this song that it was absolutely unbroken, with the comment that this is very unusual for so long a song. The following figures, collected at different times over a pe...

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