This is a terrible movie with one questionable virtue: the spectacle of dozens of real rats really shotgunned. It looks like they used a 20 gauge. It could be some kind of stunt, but nobody told the rats. Certainly these rats react violently to the projectiles that hit them, and they don't seem to like it. They are knocked end over end by bloody impact. Meat flies off the wounds, even. They seem hurt, and they squirm pretty convincingly. Perhaps they are good rat actors.There is lots of bad process photography, and the puppet rat heads are unimpressive. But the real rats are filmed against miniature sets in medium and long shots. Such wholesale slaughter seems unlikely as late as '76, but I doubt the FOTG set even saw a caterer, much less OSHA and the Humane Society. I don't know anything about this production, but I've shot a few rats, and this is what it looks like.