American elk or wapiti (Cervus canadensis), mule deer (Odocoileus hemionus macrotis), bighorn sheep (Ovis canadensis canadensis and O.c. texiana), and bears (Euarctos and Ursus) seemingly once inhabited the Chaco plateau.    From Wordnik.com.  [Tseh So, a Small House Ruin, Chaco Canyon, New Mexico :] Reference

Euarctos americanus, although that animal is seldom encountered in much of the United States.).    From Wordnik.com.  [VERBATIM: The Language Quarterly Vol XIX No 2] Reference