10 



How to Sex Cage Birds. 



SEXUAL DIFFERENCES IN HEADS OF ROBINS 



The Nightingale (Daulias luscinia). 



The Nightingale is practically a more uniformly coloured Robin : 

 and in Stark and Sclater's Birds of South Africa the Eastern 

 Nightingale is referred to the same genus as our Redbreast. Un- 

 like the Robin, however, there appears to be little if any colour 

 difference in the sexes of the Nightingale, so that one must 

 determine the male by its narrower form and more delicate, longer 

 bill. The hen of the Eastern Nightingale is said to be larger than 

 the cock, but I suspect it would be more correctly described as 

 stouter. 



The Red-spotted Bluethroat (Cyanecula succica). 



There seems to be a difference of opinion among ornithologists as 



to whether this lovely little bird is more nearly related to the 

 Robins or the Chats ; some say that its actions closely resemble 



an \nn.T NIGHTINGALE. 

 (Photographed by Mr II. Puryer.) 



