66 VERTEBRATES: BIRDS. 



eared Owl has very long ear-tufts, and its cry is pro- 

 longed and plaintive, consisting of two or three notes 

 repeated at intervals ; the Gray Owls are very large ; 

 the Saw Whet Owl is small, and its notes sound like 

 the noise made in filing a saw; the Burrowing Owls 

 are very small, and live in the burrows of the Prairie 

 Dog ; and the Snowy Owl is large, and, unlike the pre- 



Fig. 109. Snowy Owl. 



ceding ones, hunts in the daytime as well as at twilight. 

 It lives in the cold regions, and is seen in the United 

 States only in winter. 



CLIMBERS, OR SCANSORES. 



These birds have the toes in pairs, > tso in front and 

 two behind. Parrots, Cuckoos, and Woodpeckers are 

 the principal kinds. 



