The dataset contains capture data from the small mammal surveys that were conducted on St. Lawrence Island from July 19 to 27, 2012. Ten transects were set within a two mile radius of the villages of Gambell and Savoonga. Transects consisted of a series of trapping stations spaced every 5 to 10 meters. Each trapping station had two Sherman traps (baited with peanut butter and rolled oats) and/or unbaited pitfall traps placed within two meters of each other.

Individual trapping sessions ranged from 4 to 8 hours and occurred during both day and night. Depending on the species and number of individuals captured, transects were kept open from 4 hours (1 trapping session for pitfall traps) to 2 days (multiple trapping sessions). A total of 61 small mammals were trapped over 4,948 trap hours. All captures were made in Sherman traps.