Season 13, Episode 10 of Mountain Men, Bear Down, features one of the series’ most intense and harrowing pursuits: Bret Boh and Ivy O’Guinn take on a grizzly bear in dangerously steep terrain.

They all follow the same mountain man code. But regional differences matter, says Mike “Tio Miguel” (Uncle Mike) Morgan, a trapper and ex-Navy captain who joined his friend Olsen’s Montana ...