Antarctic krill are small, shrimp-like crustaceans found in the Southern Ocean surrounding Antarctica. They play a crucial role in the marine ecosystem, serving as a primary food source for various species, including blue whales, seals, and penguins. These tiny creatures can grow up to 6 centimeters long and are known for their swarming behavior, forming large groups that can be seen from space. Krill primarily feed on phytoplankton, which are microscopic plants that thrive in cold, nutrient-rich waters. They have a unique ability to convert these plants into energy, making them vital for the ocean's food web. Due to their abundance, Antarctic krill are also harvested for use in aquaculture and dietary supplements.