136 
THIRTEENTH REPORT. 
OBSERVATION ON THE MAMMALS OF THE DOUGLAS LAKE 
REGION, CHEBOYGAN COUNTY, MICHIGAN.* 
ORRIN J. WENZEL. 
Douglas Lake lies in the northern part of the southern peninsula of 
Michigan, about eighteen miles south of Mackinaw City and about twelve 
miles east of the city of Cheboygan. 
In general, the region is an old pine “slashing” which at present is 
covered by white birch, brake ferns, and a few huckleberry and black- 
berry bushes. Occasionally one finds a small patch of hardwood or a 
cedar swamp to break the monotony of the sandy “pineries,” and along 
the shores of the lake are to be seen in places fringes of tall pines which 
have either escaped the axes of lumbermen or found conditions more 
favorable for growth after they had passed. One or two sphagnum 
bogs are also to be found within two miles of Douglas Lake. 
In this varied region, the University of Michigan maintains its Sum- 
mer Biological Station, and it is here that the writer had occasion to 
make a few observations on the mammals of the region along with other 
work carried on at the station. An attempt was made to study the 
animals at certain stations. The latter were chosen arbitrarily but 
each one selected differed in some respects from the others. They were 
all so nearly alike, however, that no very striking results were obtained 
by this method. 
The specimens taken are in the University of Michigan Museum, and 
the numbers in the list of species are those which have been given to them 
in the museum catalogs. It is hardly necessary to state that this paper 
gives but an incomplete idea of the mammalian life of the Douglas Lake 
region. The writer believes, however, that the records obtained are re- 
liable and trusts that as a preliminary report this paper will prove of 
some assistance both to those interested in the mammalian life of the 
region and students of the general fauna of the state. 
I wish to acknowledge my indebtedness to Dr. A. S. Pearse and Dr. 
A. G. Ruthven for helpful suggestions and criticisms both in the field 
work and in the preparations of this paper. 
LOCATION OF STATIONS. 
Station I. This station was the immediate region of the camp. The 
soil was sandy and overgrown with brake ferns, huckleberry bushes, and 
white birch with a row of tall pines along the shore of the lake. Here 
only white-footed mice, chipmunks, and occasional^, though rarely, a 
red squirrel were taken. 
Station II. The area comprised in this station was what is known 
as Grape-vine Point. Nearest the water’s edge is an alluvial flat cov- 
*Contributions from the Zoological Laboratory of the University of Michigan, No. 133. (Biological 
Station Series, Zoological Publication No. 3). 
