Ingo Arndt / Antarctic Krill (Euphausia superba) with yellow algae in stomach, a small shrimp-like crustacean is the most important zooplankton in the Antarctic food web, Weddell Sea, Antarctica

Flip Nicklin / Antarctic Krill (Euphausia superba) feeding on algae-covered ice, a small shrimp-like crustacean is the most important zooplankton in the Antarctic food web, Antarctica

Flip Nicklin / Antarctic Krill (Euphausia superba) mass feeding on algae growing on underside of ice, Antarctica

Flip Nicklin / Antarctic Krill (Euphausia superba) a small shrimp-like crustacean is the most important zooplankton in the Antarctic food web, Antarctica

Flip Nicklin / Antarctic Krill (Euphausia superba) mass, Antarctica

Flip Nicklin / Antarctic Krill (Euphausia superba) crustacean, Antarctica

Flip Nicklin / Antarctic Krill (Euphausia superba) schooling underwater, this small shrimp-like crustacean is the most important zooplankton in the Antarctic food web, Antarctica

Flip Nicklin / Antarctic Krill (Euphausia superba) feeding on algae-covered ice, Antarctica

Flip Nicklin / Antarctic Krill (Euphausia superba) group, a small shrimp-like crustacean is the most important zooplankton in the Antarctic food web, Antarctica

Solvin Zankl / Antarctic krill (Euphausia superba) from deep sea Antarctic Ocean.

David Tipling / Antarctic Krill (Euphausia superba) Antarctica, January

Norbert Wu / Antarctic Krill (Euphausia superba), Palmer Station, Antarctic Peninsula, Antarctica