File:How to sex cage birds (British and foreign) (1907) (14772268603).jpg

Identifier: howtosexcagebird00butl (find matches)
Title: How to sex cage birds (British and foreign)
Year: 1907 (1900s)
Authors: Butler, Arthur G. (Arthur Gardiner), 1844-1925
Subjects: Cage birds Sex
Publisher: London, "The Feathered world", "Canary and cage-bird life"
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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dby a longer and more slender form of bill. In most species this is awell-marked character, though in typical Corvus, or Corone (as thegenus is sometimes called), the difference between the sexes is lessstrongly defined than in most of the other genera. It will, I think, be more convenient to note the English andforeign species under each genus :— The Choughs (Pyrrhocorax). Common Chough (Pyrrhocorax graculus). The female has a shorter and slightly thicker bill than the male;she is also a trifle smaller. Alpine Chough (Pyrrhocorax alpinus). In this short-billed species the sexual differences are similar incharacter to those of the preceding. Nutcracker (Nucifraga caryocatactes). Contrary to Stevensons statement, the bill of the male is longerand rather more slender than that of the female; she is also arather smaller bird, and her wings are a little browner. Somemales have a tawny suffusion on the spots on the breast, but thismay be an inconstant character, 84 How to Sex Cage Birds.
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THE COMMOK JAY. The Jays.Common Jay (Garrulus glandarius). The female chiefly differs from the male in its distinctly broaderand shorter bill. This character also serves to distinguish theother species of the genus. Blue Jay (Cyanocitta cHstata). The bill of the female is distinctly shorter than that of the male,and, when viewed in profile, is seen to be noticeably deeper. Thisdifference will also serve to separate the sexes of other species inthis genus. Blue-bearded Jay (Cyanocorax cyanopogon). I could discover no sexed specimens in the British Museum series,but the sexes doubtless differ, as in the following: — Pileatkd Jay (Cyanocorax chrysops).* When viewed from above, the hill of the female is distinctlybroader than that of the male, hut there seems little, if any, differencein its length. * This is the scientific name given to the species in the Museum Catalogue, Crow-Like Birds. 85 Canada Jay (Perisoreus infaustus). The bill of the female is heavier and shorter than that of

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