The diet of whales varies depending on the species, location, and time of year.

Some whale species, like the baleen whales, feed on krill, small shrimp-like crustaceans, and other small organisms by filtering them through their baleen plates, which act as a sieve. Other baleen whales, such as humpback whales, also feed on small fish and plankton.

Toothed whales, on the other hand, like killer whales and sperm whales, feed on a variety of prey, including fish, squid, and sometimes even other marine mammals.

Overall, whales are important components of the marine food web, and their diets can have significant impacts on the ecosystems they inhabit.