Norbert Wu / Scuba diver exploring ice caves below Weddell Seal (Leptonychotes weddellii) breathing holes, life below feeds on seal feces, Antarctica

Norbert Wu / Weddell Seal (Leptonychotes weddellii) breathing hole is above this ice cave with diver, the cave is filled with Sea Stars (Odontaster validus) that feeds on seal feces, Antarctica

Norbert Wu / Antarctic Sun Starfish (Labidiaster annulatus), Palmer Station, Antarctic Peninsula, Antarctica

Norbert Wu / Brittle Star (Ophionotus victoriae) trying to defend itself against Antarctic Sun Starfish (Labidiaster annulatus), Palmer Station, Antarctic Peninsula, Antarctica

Norbert Wu / Sea Star (Perknaster aurorae) on Brown Algae (Himantothallus grandifolius) and scuba diver, Palmer Station, Antarctic Peninsula, Antarctica

Norbert Wu / Antarctic Sun Starfish (Labidiaster annulatus), Hydrozoan (Candelabrum penola), and Sponge (Mycale acerata) below kelp forest, Palmer Station, Antarctic Peninsula, Antarctica

Hiroya Minakuchi / Sea Star (Odontaster sp) and limpet, Antarctica

Luciano Candisani / Antarctic Sun Starfish (Labidiaster annulatus), Admiralty Bay, King George Island, South Shetland Islands, Antarctica

Flip Nicklin / Starfish with Krill (Euphausia superba) prey, Antarctica

Norbert Wu / Feather Star (Promachocrinus kerguelensis) primitive relative of the Starfish, highly mobile, mouth is located in center of ring of arms, Antarctica

Norbert Wu / Sea Star (Odontaster validus) group feed on dead Weddell Seal (Leptonychotes weddellii) pup, Antarctica

Norbert Wu / Ice cave below Weddell Seal (Leptonychotes weddellii) breathing holes are filled with Sea Stars (Odontaster validus) and other life which feed on Seal feces, Antarctica

Norbert Wu / Ice cave below Weddell Seal (Leptonychotes weddellii) breathing holes is filled with Sea Stars (Odontaster validus) which feed on Seal feces, Antarctica

Norbert Wu / Spongivorous Sea Star (Perknaster fuscus antarcticus) in foreground, Weddell Seal (Leptonychotes weddellii) breathing at ice crack in background, Antarctica

Norbert Wu / Sea Star (Odontaster validus) group attach another Sea Star (Acodontaster conspicuus) in ice cave under breathing hole, Weddell Sea, Antarctica

Norbert Wu / Proboscis Worm (Parborlasia corrugatus) group and Sea Stars (Odontaster validus) feed on seal feces underneath a Weddell Seal breathing hole, Antarctica

Norbert Wu / Sea Star (Odontaster validus) gather in ice caves below Weddell Seal breathing holes to feed on seal feces, Antarctica

Norbert Wu / Sea Star (Odontaster validus) group, urchins, and Bootlace Worms (Nemertea) under anchor ice which forms in water less that 33 meters deep, Antarctica

Norbert Wu / Pencil Urchin (Ctenocidaris perrieri) and Brittle Star (Ophionotus victoriae) similar to deep sea species, New Harbor, Antarctica

Norbert Wu / Nudibranch (Tritoniella belli) uses chemical defenses to protect itself from predators, Antarctica

Norbert Wu / Anchor ice forms in water less than 33 meters in depth, provides habitat for mobile animals such as Sea Stars, Sea Urchins, and Nemertean or Proboscis Worms, Antarctica

Norbert Wu / Sea Star (Odontaster validus) and Nemerteans (Parborlasia corrugatus), Antarctica

Norbert Wu / Sea Star (Odontaster validus) group in ice cave below seal hole, attack and feed on another Sea Star (Acodontaster hodgsoni), Antarctica

Norbert Wu / Giant Antarctic Isopod (Glyptonotus antarcticus) in newly formed anchor ice, and Sea Stars (Odontaster validus), Antarctica

Norbert Wu / Sea Star (Odontaster sp) climbing up the stalk of a Feather Duster Worm (Perkinsiana sp) uses feathery gills to filter seawater for food particles, Antarctica

Norbert Wu / Sea Star (Odontaster validus) and Sea Spider (Pycnogonidae) amid anchor ice, Antarctica

Norbert Wu / Sea Urchin (Sterechinus neumayeri) group and Sea Stars gather on an ice fall to eat algae, Antarctica

Norbert Wu / Sea Star (Odontaster validus) group feeding on Algae, Weddell Seal (Leptonychotes weddellii) near surface of undersea ice crack, Antarctica

Norbert Wu / Sea Star (Odontaster validus) group feeding on seal feces under sea ice crack around mainland, Antarctica

Norbert Wu / Feather Duster Worm (Perkinsiana sp) in seafloor community, use their feathery gills to fan water for food particles, Antarctica

Norbert Wu / Sea Star (Homaxinella balfourensis) that is covered in anchor ice, Antarctica

Norbert Wu / Sea Star (Homaxinella balfourensis), Antarctica

Norbert Wu / Sea Star (Homaxinella balfourensis) covered in anchor ice, anchor ice forms in water less than 33 meters in depth, Antarctica

Norbert Wu / Giant Antarctic Isopod (Glyptonotus antarcticus) in newly formed anchor ice, and Sea Stars (Odontaster validus), Antarctica

Norbert Wu / Sea Star (Odontaster validus) group in ice cave below seal hole, attack and feed on another Sea Star (Acodontaster hodgsoni), Antarctica

Norbert Wu / Proboscis Worm (Parborlasia corrugatus) group and Sea Stars (Odontaster validus) feed on Seal feces beneath Seal's breathing hole, Antarctica

Norbert Wu / Sea Star (Odontaster validus) group attacking and eating a Sea Urchin (Sterechinus neumayeri), Antarctica

Norbert Wu / Sea Anemone (Urticinopsis antarctica) feeding on a Spongivorous Sea Star (Perknaster fuscus antarcticus), Antarctica