Bryan and Cherry Alexander / Cape / Pintado petrels feeding on Krill (Euphausiacea) by the abandoned whaling station at Whalers Bay. Deception Island, South Shetland Islands, Antarctica.

Bryan and Cherry Alexander / Cape / Pintado petrels feeding on Krill (Euphausiacea) by the abandoned whaling station at Whalers Bay. Deception Island, South Shetland Islands, Antarctica.

Troels Jacobsen/Arcticphoto / Large and small Krill (Euphausiacea) on a black glove. Swimming in huge swarms, these crustaceans provide sustenance to most Antarctic marine wildlife. Antarctica.

Steven Kazlowski / Krill (Euphausiacea) swarming around floating sea ice during summer, Svalbard, Norway

Solvin Zankl / Deepsea krill {Bentheuphausia amblops} Atlantic ocean

Solvin Zankl / Euphausiid / krill {Euphausia gibboides} Atlantic ocean

David Shale / Lateral view of Krill {Euphausiacea} mid atlantic ridge, 100-150m at night

David Shale / Lateral view of Krill {Euphausiacea} mid atlantic ridge, 100-150m at night

Doug Allan / Krill at sea surface {Euphausiacea} Monterey Bay, CA, USA

Todd Pusser / Large school of Krill {Euphausiacea sp.} at surface, Monterey Bay, USA.

Patricio Robles Gil / Sample bottle of Krill {Euphausiacea} Gulf of California, Mexico

Sue Flood / Krill at sea surface {Euphausiacea} Monterey, CA, USA - food for Grey whale

Peter Scoones / Krill {Euphasia sp} Antarctica

Martha Holmes / Krill {Euphausiacea} from a catch off South Georgia