7 8 ELEMENTS OE OHNITHOLOfll. 



do Puff-birds. They give out either a mellow, musical note or a 

 whistling sound. 



Beaks still larger, and occasionally much heavier than those 

 of any of the lately mentioned groups, are found in the 

 Hornbills. These Birds are much larger than Toucans, 



Fig. 80. 



The Eed-necked Hornbill (Bweros rufieollis). 



and they are as entirely confined to the warm parts of the 

 Old World, as the latter are to those of the New. Hornbills 

 are found in Ethiopic Africa and the warmer parts of Asia, 

 down to New Guinea, where the Eed-necked Hornbill {Bueeros 

 rufieollis) is to be met with. These Birds have a very curious 

 habit. The Hen makes her nest within a hollow tree, and there 



