What we infer about polar bears with this competition and lack of diet is that since the polar bears don't have much competition in the water, they believe they have enough food for themselves in the water. But, they want to feed on land based diets that are lower in fat. They embark on terrestrial hunting which shows that they are not satisfied with what they have in water. They choose to eat the little that the grizzly bears are managing.
Let's understand what polar bears and grizzly bears are:
What are Polar bears and Grizzly bears?
Polar bears are known to be hyper-carnivorous bears that live within the Arctic. These bears feed seals and eat harp and hooded seals. They also scavenge on carcasses of whales, walruses, etc.
Grizzly bears are known to be omnivores. They are light-coloured bears; a kind of brown bear. They feed on fruits, grasses, fleshy roots, etc.
There is limited food due to competition between the polar bear and the grizzly.
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