List of Ilustrations 
FACING PAGE 
BRAZILIAN TROUPIAL 5‘ 
This species (/cterus vulgaris) is that most frequently seen in 
captivity; the pattern of colour is found in several other allied 
forms. 
By permission of Messrs Hutchinson & Co. 
InDIAN BLacK-HEADED ORIOLE 
Several other orioles besides this (0. me/anocephalus) have 
the black head, 
By permission of Messrs Hutchinson & Co. 
QUEEN WHYDAH 
This species (Tetraenura regia) is a typical example of 
seasonal sexual dimorphism, the male being long-tailed and 
conspicuously coloured only during the breeding season, and at 
other times resembling the sparrow-like female. 
By permission of the Foreign Bird Club. 
CouRTSHIP OF SKYLARK 
Illustrating display by a species with no decorative colouring 
or sex difference, 
xix 
284 
284 
314 
