When Spielberg’s monster hit Jaws arrived in theatres in the summer of ’75, the onslaught of rip-offs to follow was staggering, with such notable entries as 1977’s Orca,1978’s Piranha, and 1984’s The Last Shark, but such rip-offs were not relegated to creatures of the sea, and thus we got such “classics” as 1976’s Grizzly and the…