We collected snow density measurements at camera sites from December 2020 - April 2021, at the same time as snow hardness measurements. We took measurements every few weeks as logistics allowed. We took samples near the camera site in snow visually similar to the snow in the camera viewshed (the geographical area that is visible from a location) to prevent snow conditions from being disturbed beyond normal camera deployment. We took snow density samples using a homemade prairie sampler in snow depths 100 cm. The sampler was inserted into the snow to remove a snow core. We retained the core if the depth of snow in the sampler was at least 90% of the actual snow depth and the base of the snowpack had been reached as evidenced by litter or a soil plug at the base of the core. After we removed the soil plug, we weighed the core to determine its snow-water equivalent (SWE). We converted the SWE measured with the samplers into a density measurement by dividing the SWE by the snow depth. If a snow core of adequate quality could not be obtained after several minutes of effort, we did not measure snow density on that sampling occasion.