* Food Chain: Polar bears sit at the top of the Arctic food chain.
* Diet: Their primary food source is seals, which are secondary consumers. Seals, in turn, eat fish and other marine organisms that are primary consumers.
* Energy Flow: Polar bears consume animals that have already consumed other animals, making them tertiary consumers. They are not herbivores or primary consumers that directly feed on plants.
In summary: A polar bear's position in the food chain, consuming secondary consumers like seals, makes it a tertiary consumer.