Vireos Awake and Asleep 113 



This Gull will occasionally doze with head drawn in and eyes 

 closed, but usually conceals its head in its feathers like a Hawk 

 or Vireo. But if at such times the Gull is dull of sight its 

 hearing is keen, for at an alarm it will suddenly throw up its 

 head and with outstretched neck scream loud enough to be 



Fig. 66. Female Red-eyed Vireo, asleep on nest. Pho- 

 tographed after sundown, with an exposure of twenty min- 

 utes, July 5, 1902, 7 : 107 : 30 P. M. The head of the bird 

 is twisted to the left side the bill pointing to the right of 

 the picture and is buried up to the eyes in the feathers of 

 the back. 



heard for half a mile. Some of the Pheasants sleep with the 

 head either drawn in on shortened neck, or turned back and 

 concealed. In calm seas Duck and other water-fowl often sleep 

 when afloat. So far as I have observed, the same bird always 

 turns its head to the same side in sleep, and this seems to follow 

 as a matter of course from the force of habit. 



