Chap. XIII. 



Law of Battle. 



3^5 



are larger in the male than in the female. 16 In certain plovers, 

 however, the wing -spurs must be considered as a sexual cha- 





Fig. 28. Palamedea cornuta (from Brehm), shewing the double wing-spurs, and the 



filament, on the head. 



16 For the Egyptian goose, see p. 639. For Plectropterus, 'Living- 

 Macgillivray, ' British Birds,' vol. iv. stone's Travels,' p. 254. For Pala- 



