SiMPL Wildlife Magnets: A Camera Trap Tool for Detecting All Creatures Great and Small

We created the SiMPL wildlife magnet-a baited camera trap design that allows passive monitoring of wildlife, particularly small- to medium-sized mammals. The SiMPL wildlife magnet is inexpensive and easy to construct. To evaluate its effectiveness, we conducted a two-year case study using 9 camera stations along an elevation gradient in the White Mountains of the northeastern United States. We examined how the detection probability of mammal species changed with the inclusion of a SiMPL wildlife magnet using data from pre-and post-establishment. We found a significant increase in community-level detection probability with the use of SiMPL wildlife magnets and for individual species, including red squirrels (Tamiasciurus hudsonicus), American marten (Martes americana), and fisher (Pekania pennanti). Moreover, we were able to capture more species with SiMPL wildlife magnets than without, including flying squirrels (Glaucomys spp.), various rodents (Cricetidae spp.), black bears (Ursus americanus), moose (Alces alces), owls, and other birds. The SiMPL wildlife magnet is an effective, low-cost method for surveying wildlife communities, especially rodents and mesocarnivores. It addresses the limited field of view presented by other techniques for capturing small mammals on camera traps and enables efficient collection of phenology data, including vegetation and snowpack. This tool has several applications, including monitoring species' responses to management practices and global change.