In the Okanagan Valley of British Columbia, California bighorn sheep (Ovis canadensis california) populations have declined by 60% since 2011, likely due to a new mite infestation, Psoroptes ovis. These mites cause hearing loss and impaired awareness in wild sheep, possibly increasing their vulnerability to predation by cougars (Felis concolour). To assess this risk, data from GPS-collared bighorn sheep between 2014 and 2019 will be compared, in collaboration with the Government of British Columbia.