After the phenomenal success of “Jaws” in 1975, there was a cash-in surge for further “nature strikes back” creature features, as mankind was successively imperiled by dogs, cats, whales, buffalo, piranha and so on. One of the most blatant of these knockoffs was William Girdler’s 1976 “Grizzly,” an undistinguished tale of hairy menace running amok […]