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Chap XIII.
Law of Battle.
365
are larger in the male than in the female.[1] In certain plovers, however, the wing-spurs must be considered as a sexual cha-
![](http://upload.wikimedia.org/wikipedia/commons/thumb/7/7f/Descent_of_Man_-_Burt_1874_-_Fig_38.png/500px-Descent_of_Man_-_Burt_1874_-_Fig_38.png)
Fig. 38. Palamedea cornuta (from Brehm), shewing the double wing-spurs, and the filament on the head.
- ↑ For the Egyptian goose, see Macgillivray, 'British Birds,' vol. iv. p. 639. For Plectropterus, 'Livingstone's Travels,' p. 254. For Pala-