The identification of genes influencing fitness is central to our understanding of the genetic basis of adaptation and how it shapes phenotypic variation in wild populations. Here, we used whole‐genome resequencing of wild Rocky Mountain bighorn sheep ( Ovis canadensis ) to >50‐fold coverage to identify 2.8 million single nucleotide polymorphisms ( SNP s) and genomic regions bearing signatures of directional selection (i.e. se...