Fish:
* Cod: One of their main food sources, especially in the North Atlantic.
* Haddock: Another abundant fish they prey on.
* Halibut: Larger individuals can hunt these flatfish.
* Herring: A significant part of their diet, especially in the North Pacific.
* Other sharks: They are known to cannibalize their own species, particularly smaller individuals.
Marine Mammals:
* Seals: They can hunt and kill seals, especially harp seals and hooded seals.
* Walruses: Larger individuals have been observed preying on walruses.
* Porpoises: Occasionally include porpoises in their diet.
Other:
* Squid: A common food source, especially in deeper waters.
* Birds: They are known to snatch seabirds from the surface.
* Carrion: They are scavengers and will consume carcasses of dead animals.
Their diet varies depending on their location, size, and the availability of prey. They are highly adaptable and can survive in harsh conditions, even when food is scarce.