Origine: Swifts in a Tower (1956), p. 108, 2nd edition, 1973
David Lack:
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frasi
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Mi piace
David Lack: Frasi in inglese
“... Female song is uncommon in birds.”
[The Life of the Robin, https://books.google.com/books?id=wZs_AAAAYAAJ, 1943, H.F. & G. Witherby Limited] p. 28
The Life of the Robin (1943)