Hooded seals often find themselves the host of parasitic worms, such as heartworms, Dipetalonema spirocauda. Often these parasites result in shortened lifespans. Hooded seals are predators of many fishes, such as polar cod, squid, and various crustaceans. They are preyed on by sharks, orcas, and polar bears.
- heartworms (Dipetalonema spirocauda)
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