42 SEXUAL SELECTION : BIRDS. Part II. 
provokes a general battle."^ Of the pugnacity of web- 
footed birds, two instances will suffice : in Guiana “ bloody 
fights occur during the breeding-season between the 
^ Macgillivray, ‘ Hist. Brit. Birds,’ vol. iv. 1852, p. 177-181. i 
Fig 3T. The Ruff or Machetes pugnax (from Brehm’s ‘ Thierleben ’). 
