Occasional Papers of the Museum of Zoology 9 



Seiurus noveboracensis notabilis. Grinnell water-thrush. Summer. 



Hylocichla alicicB alicicc. Gray-cheeked thrush. Summer. 



Ixoreus ncevius meruloidcs. Northern varied thrush. Summer. 



Saxicola oenanthe (enanlhe. Wheatear. Summer. 



Sorex hmdrensis. Tundra shrew (Osgood). 



Ursus americanus americanus. Black bear. 



Vulpes alascensis alascensis. Alaska red fox. 



Mustela vison ingens. Alaska mink. 



Lutra canadensis canadensis. Canada otter. 



Microtus xanthognalhus. Chestnut-cheeked vole (Osgood). 



Fiber zibelhicus spatulatus. Northwestern muskrat. 



Erethizon epixanthum myops. Alaska porcupine. 



Castor canadensis canadensis. Canada beaver. 



Lepus americanus macfarlani. Macfarlane snowshoe hare. 



Alces gigas. Alaska moose. 



The shore habitat comprises the areas of nearly bare mud, sand, 

 and gravel found along the shores of the streams and lakes. It is 

 often only a narrow strip a few feet in width, but along the larger 

 rivers it may in places expand into bars many rods in width and 

 miles in length. The habitat is washed over at periods of high 

 water, especially in the spring, and as a rule supports little vegeta- 

 tion. A few scattered willows may occur, and sometimes scattered 

 herbaceous plants; rarely a thin growth of horsetails is found* 

 In parts of streams and in sloughs where the current is sluggish 

 and where the shore habitat is composed mostly of wet mud bars, 

 there is a tendency for these to become rapidly covered by horse- 

 tails, sedges, willows, and other plants, and so to pass into the 

 swamp-meadow or willow-alder type of habitat. 



The shores are the feeding- and resting-places of a number of 

 species of birds; and they are also used by several species of 

 mammals as routes of travel and as hunting places. 



Cut-bank habitat and association: 



Slreptoceryle alcyon caurina. Western kingfisher. Summer, breeding. 

 Tachycineta thalassina lepida. Northern violet-green swallow. Summer 



(Blackwelder). 

 Riparia riparia riparia. Bank swallow. Summer, breeding. 

 Lemmus yukonensis. Yukon lemming (Osgood). 

 Microtus mordax. Merriam vole (Osgood). 

 Citellus osgoodi. Yukon ground squirrel. 



