These are the data associated with the paper "Defining Null Expectations for Animal Site Fidelity" by Picardi et al. The file muledeer_summer2016.rds is a data frame containing GPS tracking data for one individual mule deer during the summer of 2016 in Wyoming, USA. The file env_stack_issa.tiff is a raster stack containing environmental layers for the landscape where the mule deer was located. The layers in the stack are, in order: distance to roads (meters), distance to streams, rivers, or water bodies (meters), elevation (meters), slope (degrees), aspect (), topographic position index, terrain ruggedness index, roughness, percent tree cover, and forage biomass.