° 1911 J TAVERNERond Swales, Migration of the Saw-whet Owl. 329 



necessarily return to the same locality in which they have nested 

 before. 



It is evident that the presence or absence of Waxwings in a 

 given locality is due to the abundance or lack of a supply of the 

 berry or fruit that forms the major part of their food. A later 

 experience in the vicinity of Bozeman, Montana, confirms this. 

 During the summer of 1908 there were no Waxwings that I ob- 

 served in the vicinity of Bozeman. The next year, however, they 

 appeared in June and were abundant throughout the summer. 

 During this time I found two Waxwing nests in shade trees along 

 the streets of Bozeman and could doubtless have found many if I 

 had had time for search. In this region the service berry (Amelan- 

 chier alnifolia) forms the principal article of food. This berry was 

 very abundant about Bozeman in 1909 and correspondingly scarce 

 in 1908. During the summer of 1910, in a few short visits to 

 Bozeman, I again found Waxwings quite common and service 

 berries fairlv abundant. 



NOTES ON THE MIGRATION OF THE SAW-WHET OWL. 



BY P. A. TAVERNER AND B. H. SWALES. 



From all written accounts it appears that the Acadian, or Saw- 

 whet, Owl {Cryptoglaux acadia acadia) is generally regarded as a 

 resident wherever found or that, if it migrates at all, it is but 

 slightly and the movement is limited to the northern and southern 

 extremes of its range. This view is reflected by the citations from 

 the following authors. 



Wilson. "This species is a general and constant inhabitant 

 of the Middle and Northern States." x 



A. K. Fisher. "The species is not migratory but is more or 

 less of an irregular wanderer in its search for food during the fall 

 and winter." 2 



i Wilson. American Ornithology. Brewer ed., 1840, 310. 

 2 Fisher. Hawks and Owls of the United States in Their Relation to Agriculture, 

 1893, 161. 



