88 
SEXUAL selection: birds. 
Part II. 
males, one after tlie otlier.^^ With Birds of Paradise 
a dozen or more full-plumaged males congregate in a 
tree to hold a dancing-party, as it is called by the 
natives ; and here flying about, raising their wings, 
Fig* 50. Rupicola crocea, male (from Brehm). 
elevating their exquisite plumes, and making them 
vibrate, the ^yhole tree seems, as Mr. Wallace re- 
‘Journal of R. Geograpli, Soc.’ vol, x. 1840, p. 236. 
