Suffolk and Berkshire, Henry Charles Howard, Earl of, 1833-1898, Peek, Hedley, Aflalo, Frederick G. (Frederick George), 1870-1918 · London : Lawrence and Bullen · leaf 422
, Proc. Zool. Soc. 1858, p. 202.) … In the opinion of the writer it is caused bya vibratory movement of the flight feathersin the downward descent of the bird (ashappens with varying sounds in the peewitand rook); and this is the view taken byNaumann, Jardine, Hancock, Saxby, Chapman,and other observant naturalists. A long chapteron…
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