Last of the plainsmen
(Book)

Big, brash and fearless, Buffalo Jones is in pursuit of the greatest mountain lion ever spotted in the remote Arizona desert. Determined to bring the beast home alive, Jones leads a colorful band of brothers into a wild land, across the Colorado River to Buckskin Mountain at the red mesa rim of the Grand Canyon. But while Jones has foresworn all killing, even smashed his rifle on a wagon wheel in a vow to save the species, he and his men are entering a fight for their lives. If Apaches, stampedes of wild horses or rattlesnakes don't get them, another enemy will: roaming packs of the one beast who fears no man.