What is krill?

Krill is a Norwegian word that means ‘whale food’. These are small shrimps about 6 cm long, which feed mainly on algae and are found in huge swarms in the cold waters. Krill is the main food of whales, octopuses, seals, penguins, albatrosses, and other seabirds. Krill is also known as the light shrimp, because it has luminous organs at the eyestalk and on various parts of the body, which emit a yellow-green light.