Heart, esophagus, diaphragm and skeletal muscle tissue obtained from various herbivores on the National Bison Range were examined grossly for Sarcocystis. Sarcocystis was found in 81,50,50, and 13% of the mule deer, (Odocoileus hemionus), white-tailed deer (O. virginianus), elk (Cervus elaphus), and bison (Bison bison), respectively.