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target="_blank" rel="nofollow" href="#ulink_9c9912bf-f7cb-5440-84ca-dd4f125996a7">[8] E. Selous, "Sexual Selection in Birds," Zoölogist, Feb., 1907, p. 65; ib., May, p. 169. Sexual aberrations generally are not uncommon among birds; see, e.g., A. Heim, "Sexuelle Verirrungen bei Vögeln in den Tropen," Sexual-Probleme, April, 1913.

      This has now been very thoroughly done by Prof. F. Karsch-Haack in a large book, Das Gleichgeschlechtliche Leben der Naturvölker, 1911. An earlier and shorter study by the same author was published in the Jahrbuch für sexuelle Zwischenstufen, Bd. iii, 1901.

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