BIRDS WHICH FEED ON INSECTS 69 



from this arrangement the Kiwis largely rely on the sense of smell 

 when hunting for worms, at which time they make a sniffing 

 sound. Unlike the woodcocks they appear to detect their prey 

 before driving in the beak, as this procedure is commonly success- 

 ful straight away. 



There are among Birds, as among Mammals, forms which 

 are specially adapted to feed on carrion. The best known of 

 such scavenging birds are Vultures and Adjutants. The former 

 are closely related to the Hawks, but present a peculiar appear- 

 ance owing to the bareness of their heads and necks, a feature 

 which has obvious relation to the nature of the food. Adjutants, 

 which are to be looked upon as large and specialized Storks, 

 present the same peculiarity, which is no doubt an adaptation 

 to the same end. 



