range from nearly entirely herbivorous (hypocarnivore) to almost entirely carnivorous (hypercarnivore), depending on local and seasonal food availability. Polar bears are carnivores, both taxonomically (they belong to the order Carnivora) and behaviorally (they subsist on a largely carnivorous diet). ...
It then digests the nutrients and some of the bacteria.How is this symbiotic? Because the food eaten by the herbivore becomes food for the bacteria. The bacteria multiply to the degree that bacterial population overages become food for the herbivore. See also Carnivore Digestive System....