4 University of Michigan 



many of the shrubs and young trees eaten or badly mutilated. 

 Under the pastured forest little underbrush or herbage remains, 

 and the conditions are very poor for small mammals. 



In all the forest, in the unpastured as well as in the pastured 

 part, a number of trees have been cut out in former years, and 

 although no trees are now being cut down, all the trees and branches 

 which fall are being cut up for firewood. This results in there 

 being few logs and little dead brush on the ground, and removes 

 a favorite place for small mammal nests and runways, as well as 

 largely eliminating as mammal food the insects and larvae which 

 are dependent on decaying wood. However, with the exception 

 of the removal of the logs and of a few trees, that part of the 

 forest to the north of the river is still in practically its native 

 condition, and it shows no evidence of ever having been pastured. 

 It is thus a splendid place for the study of the native faunal 

 conditions. 



Although the whole area in the preserve is small there are 

 other areas of adjoining forest along the Galien River, so that, 

 for the smaller mammals at least, the results of the study and 

 trapping should indicate the primitive habitat distribution. The 

 relative abundance of the different species, however, is probably 

 much changed by the decrease throughout the whole region of the 

 carnivores, which have been much hunted and trapped by man. 



The mammals of Warren Woods were intensively studied by 

 the author from July 3 to September 3 in the summer of 1919. A 

 camp was maintained near the edge of the Woods, and by trap- 

 ping and hunting every eflfort was made to determine the mammal 

 fauna of the preserve. From one hundred to two hundred traps 

 for small mammals and about twenty traps for the larger species 

 were kept constantly in operation. A small amount of trapping 

 was done in the fields and along the roadsides immediately adjoin- 

 ing the Woods and a few records were secured from the camp 

 house. 



