INTRODUCTION. 93 
land (Heteralocha acutirostris) is very remarkable because the 
two sexes have very differently shaped beaks. The male’s is 
short, straight, and conical ; the female’s is long, slender, and 
very much curved (fig. 98). 
The Bower-birds, so noted for the playing-places, or 
Fig. 96. 

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The Bell-bird (Chasmorhynchus nudicollis). 
“bowers,” which they construct, and which do not serve as 
nests, are a small group of sixteen species absolutely peculiar to 
Australia and New Guinea. Of these, the Satin Bower-bird 
(Ptilonorhynchus violaceus, fig. 99) will afford a good example. 
We may now return to consider certain Birds which are re- 
presented in our own region of the world. The Common Roller 
