https://www.ammoland.com/2025/...rizzly-bear-attacks/

The standard is different and lower than the standard to be used for self-defense against humans.

From the opinion by the Ninth Circuit issued in 2017, bold added:

“We hold the ‘good faith belief’ defense for a prosecution under 16 U.S.C. § 1540 is governed by a subjective, rather than an objective, standard, and is satisfied when a defendant actually, even if unreasonably, believes his actions are necessary to protect himself or others from perceived danger from a grizzly bear. Because the district court applied an objective standard, we vacate Wallen’s conviction and remand for further proceedings consistent with this opinion.”