Fig. 38. A Rattlesnake Den. Portion of a ledge in Sullivan County, New York, 

 which extends a distance of several hundred yards, with numerous lesser ledges 

 behind it. The top is covered with loose, shelving rocks, many of them covering 

 deep crevices. The great fissure in the center is about five feet high and extends in 

 about twelve feet, when it narrows to a crevice of great depth. Numbers of rattle- 

 snakes congregate at this den every autumn to hibernate. 



