XXII 
HIS EYES AND EARS 
Brrps’ eyes are very different from ours. To 
begin with, they are round. Then they are 
placed one on each side of the head, so that 
they can look two ways at once. Owls are the 
only birds who have eyes turned forward lke 
ours. | 
Birds’ eyes also are of many colors. Besides 
our common black, brown, blue, and gray, birds 
have light and dark green, bright red, pale and 
deep yellow and orange, even white. 
They have, like us, two eyelids. But while 
we use the upper one to close our eyes, most 
birds use the lower one. They have also a third 
eyelid, inside the others, a thin, white sort of 
skin, that moves across the eye from side to side, 
and is called the “ nictitating membrane.” 
There are other ways in which birds’ eyes 
differ from ours. The men who try to know 
exactly how birds are made have found out that 
birds’ eyes make everything look much larger 

