A jar of krill specimens with visible eye spots. Blue whales eat huge volumes of these small crustaceans. Blue whales eat krill - tiny, shrimp-like crustaceans that live throughout Earth's oceans. The ...

Blue whales are the largest animals ever to have lived. These colossal cetaceans often reach 30 metres in length and can weigh up to 180 tonnes - so they need to eat a lot to keep them swimming. But ...