Toothed whales mostly eat fish and squid , along with shrimp, and some marine mammals. Orcas even eat other whales.

The Food Chain of an Orca
Orca		Seal		Squid		Fish		Zooplankton		Phytoplankton

Baleen whales

Baleen whales sieve small organisms through their baleen for nourishment. They filter feed tiny crustaceans (krill - mainly Euphausia superba, copepods, etc.), plankton, and small fish (including herring, mackerel, capelin, and sandeel) from the water (or the sediment on the ocean floor). Baleen whales can be gulpers or skimmers:

• Gulpers are filter feeders that occasionally take large gulps of concentrated food (usually tiny crustaceans and small fish). Food is then pushed into the gullet with the tongue. Blue whales, Humpback whales, Bryde's whales, and fin whales are gulpers.
• Skimmers (also known as skim feeders) are filter feeders which swim slowly through the water with their mouth open, letting water flow through their baleen plates, collecting food all the while. Right whales are skimmers; bowheads and sei whales are skimmers some of the time.

The Food Chain of a Blue Whale
Blue whale		Zooplankton		Phytoplankton

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