Blue whales eat krill - tiny, shrimp-like crustaceans that live throughout Earth's oceans. The huge whales can eat up to four tonnes of krill every day. Blue whales lunge through large swarms of krill ...

But despite their enormous size, blue whales feed almost exclusively on krill - small, shrimp-like crustaceans that grow to about six centimetres. These tiny animals are found in all of Earth's oceans ...