Chris Newbert / Starry Pufferfish (Arothron stellatus) juvenile, Papua New Guinea

GEORGETTE DOUWMA / Star puffer (Arothron stellatus), Andaman Sea, Thailand

Tim Fitzharris / Ochre Sea Star (Pisaster ochraceus) group attached to rock at low tide, Miwok Beach, Sonoma, California

Ross and Diane Armstrong / Starfish mouth, Kimbe Bay, Papua New Guinea

Norbert Wu / Sea Cucumber exhibits escape response when threatened by arms of Sunflower Sea Stars (Pycnopodia helianthoides), Vancouver Island, British Columbia, Canada

Norbert Wu / Sea Cucumber exhibits escape response when threatened by arms of Sunflower Sea Stars (Pycnopodia helianthoides), Vancouver Island, British Columbia, Canada

Norbert Wu / Sunflower Sea Star (Pycnopodia helianthoides) and Purple Sea Urchin (Strongylocentrotus purpuratus) in feeding on Frilled Sea Anemones (Metridium senile), Vancouver Island, British Columbia, Canada

Norbert Wu / Common Sun Star (Crossaster papposus) which has many variations of color and patterns, but almost always 11 rays, Vancouver Island, British Columbia, Canada

Norbert Wu / Common Basket Star (Gorgonocephalus eucnemis) with branching arms which are only seen at night in warmer waters, Alaska

Tim Laman / Coral reef with table coral, sea fans, crinoid feather star and school of Golden Sweepers (Parapriacanthus ransonneti) Indo-pacific

Tim Laman / Blue-banded Goby (Lythrypnus dalli) rests on coralline algae near a Sea star and coral and anemone polyps. Channel Islands, pacific, California, USA

Tim Laman / Anthias fish swimming over a coral reef covered in soft corals and a yellow crinoid feather star. Primarily Lyretail Anthias (Pseudanthias squamipinnis) Vatu-i-Ra, Fiji

Tim Laman / Coral reef with table coral, sea fans, crinoid feather star and school of Golden Sweepers (Parapriacanthus ransonneti) Indo-pacific

Scott Leslie / Slender Green Sea Star (Leptasterias littoralis), Tilt Cove, Newfoundland and Labrador, Canada

Andy Reisinger / Eleven-armed Sea Star (Coscinasterias calamaria) mass at low tide, Paparoa National Park, New Zealand

Scott Leslie / Northern Sea Star (Asterias vulgaris), detail of dorsal surface, Nova Scotia, Canada

Scott Leslie / Common Sun Star (Crossaster papposus), Nova Scotia, Canada

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

Nature Production / Collection marine animals found in tide pool, including sea stars, fish, crabs, sea cucumbers, sea urchins, shrimps, worms, Japan

Chris Newbert / Blue Sea Star (Linckia laevigata) and schooling baitfish, 20 feet deep, Papua New Guinea

Chris Newbert / Emperor Shrimp (Periclimenes imperator / Zenopontonia rex) on Sea Star, 90 feet deep, Papua New Guinea

Chris Newbert / Starry Pufferfish (Arothron stellatus) juvenile 60 feet deep, Papua New Guinea

Chris Newbert / Cortez Starfish (Pentaceraster cumingi) arm with Shrimp, 80 feet deep, Papua New Guinea

Chris Newbert / Cortez Starfish (Pentaceraster cumingi) arm with Shrimp, 80 feet deep, Papua New Guinea

Chris Newbert / Cortez Starfish (Pentaceraster cumingi) arm with Shrimp, 80 feet deep, Papua New Guinea

Chris Newbert / Filefish (Monacanthidae) juvenile in Feather Star, 60 feet deep, Papua New Guinea

Chris Newbert / Filefish (Monacanthidae) juvenile in Feather Star, 60 feet deep, Papua New Guinea

Ingo Arndt / Common Brittlestar (Ophiothrix fragilis) detail, outstretched approximately eighteen centimeters, North Sea, Helgoland, Germany

Ingo Arndt / Common Brittlestar (Ophiothrix fragilis) detail, outstretched approximately eighteen centimeters, North Sea, Helgoland, Germany

Ingo Arndt / Common Brittlestar (Ophiothrix fragilis) outstretched approximately eighteen centimeters, North Sea, Helgoland, Germany

Ingo Arndt / Common Sun Star (Crossaster papposus) diameter approximately fourteen centimeters, North Sea, Helgoland, Germany

Ingo Arndt / Starfish (Astropecten irregularis) diameter approximately five centimeters, North Sea, Helgoland, Germany

Ingo Arndt / Starfish (Astropecten irregularis) diameter approximately five centimeters, North Sea, Helgoland, Germany

Ingo Arndt / European Starfish (Asterias rubens) detail diameter approximately eleven centimeters, North Sea, Helgoland, Germany

Ingo Arndt / European Starfish (Asterias rubens) diameter approximately eleven centimeters, North Sea, Helgoland, Germany

Pete Oxford / Cortez Starfish (Pentaceraster cumingi) on algae-covered reef off Fernandina Island, Galapagos Islands, Ecuador

Fred Bavendam / Fusilier (Caesio sp) streaming past a rock with orange and yellow crinoids, pink soft coral, Komodo National Park, Indonesia

Fred Bavendam / Ribboned Sweetlips (Plectorhinchus polytaenia) and soldierfish on a reef carpeted with soft corals and crinoids, Cannibal Rock, Komodo National Park, Indonesia

Fred Bavendam / Common Lionfish (Pterois volitans) hunting among feather stars, Indonesia

Brent Hedges / Head profile of Starry puffer {Arothron stellatus}, Heron Island, Great Barrier Reef, Australia

GEORGETTE DOUWMA / Starry puffer {Arothron stellatus}, Sipadan, Sabah, Malaysia

Fred Bavendam / Harlequin Ghost Pipefish (Solenostomus paradoxus) hiding among the arms of a Feather Star Crinoid, Bali, Indonesia

Norbert Wu / Ochre Sea Star (Pisaster ochraceus) among intertidal algae in tide pools, Point Lobos, Monterey, California

Fred Bavendam / Crown-of-thorns Starfish (Acanthaster planci) feeding on coral reef, Red Sea, Egypt

Ingo Arndt / Red Starfish (Echinaster sepositus) close up underside

Ingo Arndt / Red Starfish (Echinaster sepositus) close up detail of feet on underside of arm

Tim Fitzharris / Ochre Sea Star (Pisaster ochraceus) group on boulders at dusk, Beach Six, Olympic National Park, Washington

Chris Newbert / Sea Star (Thromidia catalai) 30 feet deep, Solomon Islands

Chris Newbert / Harlequin Shrimp (Hymenocera picta) paralyzing a Sea Star by injecting venom with its specialized stinging arms, 30 feet deep, Papua New Guinea

Chris Newbert / Pincushion Sea Star (Culcita novaeguineae) detail, Coral Sea

Norbert Wu / Shrimp (Periclimenes sp) live on surfaces of Starfish, Palau

Chris Newbert / Crown-of-thorns Starfish (Acanthaster planci) leg detail showing sharp toxic spines above and suction-cup feet below, Kona, Hawaii

Chris Newbert / Giant Basket Star (Astrophyton muricatum) juvenile on Common Sea Fan (Gorgonia ventalina), Belize

Chris Newbert / Atlantic Trumpet Triton (Charonia tritonis) shell and Crown-of-thorns Starfish (Acanthaster planci), Kona, Hawaii

Chris Newbert / Brittlestar (Astroboa nuda) leg detail, Coral Sea

Norbert Wu / Candy Cane Sea Star (Fromia monilis) on Acropora Coral, Seychelles, Indian Ocean

Norbert Wu / Brittlestar (Ophiothrix purpurea) on Sea Fan, Solomon Islands

Chris Newbert / Sea Star (Linckia multiflora) on corals, Kona, Hawaii

Norbert Wu / Goby (Gobiidae) on Star Coral, Similan Islands, Thailand

Norbert Wu / Sea Star (Linckia multiflora) comet, a regenerating Sea Star arm, Great Barrier Reef, Australia

Norbert Wu / Fish-eating Sea Anemone (Urticina piscivora) eating Bat Star (Asterina miniata), southern California

Norbert Wu / Crown-of-thorns Starfish (Acanthaster planci) eats coral and leaves behind bleached skeleton, Philippines

Chris Newbert / Crinoid (Comantheria sp) Leather Coral (Sarcophyton sp) and schooling fish, Papua New Guinea

Chris Newbert / Crown-of-thorns Starfish (Acanthaster planci) detail, Kona, Hawaii

Norbert Wu / Suenson's Brittle Star (Ophiothrix suensonii) on Azure Vase Sponge (Callyspongia plicifera), Roatan, Honduras

Norbert Wu / Sea Star on algae-covered coral, Great Barrier Reef, Australia

Norbert Wu / Crown-of-thorns Starfish (Acanthaster planci) population explosion, venomous starfish feed on and damage coral reefs, cause of explosion is a mystery, Palau

Norbert Wu / Sea Star showing regeneration of arms after losing them, Izu Oceanic Park, Japan

Norbert Wu / Sea Star (Odontaster validus) on Soft Coral trees (Dendronephthya sp), Fiji

Norbert Wu / Candy Cane Sea Star (Fromia monilis) pair underwater, Thailand

Norbert Wu / Candy Cane Sea Star (Fromia monilis) on Soft Coral, Thailand

Fred Bavendam / Southern Biscuit Star (Tosia australis) between the arms of a much larger Sea Star, Edithburgh, South Australia

Fred Bavendam / Red Biscuit Star (Pentagonaster dubeni) pair, Aldinga Reef, South Australia

Fred Bavendam / Sea Star (Celerina heffernani) portrait, Manado, North Sulawesi, Indonesia

Fred Bavendam / Morning Sun Star (Solaster dawsoni) attacking a Leather Star (Dermasterias imbricata) which it will take a few weeks to consume, British Columbia, Canada

Fred Bavendam / Starfish (Fromia sp) and corals on reef, Red Sea, Egypt

Fred Bavendam / Starfish (Fromia sp) portrait, on rock with algae, Maldive Islands

Fred Bavendam / Blue Sea Star (Linckia laevigata) a common shallow reef sea star, Great Barrier Reef, Australia

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

Norbert Wu / Candy Cane Sea Star (Fromia monilis) in Soft Coral tree, Seychelles

Norbert Wu / Candy Cane Sea Star (Fromia monilis) within arms reach of a Feather Star (Comanthina nobilis), Philippines

Norbert Wu / Crown-of-thorns Starfish (Acanthaster planci) feeds on and kills coral colony, Seychelles, Indian Ocean

Norbert Wu / Crown-of-thorns Starfish (Acanthaster planci) close-up of venomous spines kills coral, Similan Islands, Thailand

Norbert Wu / Rainbow Sea Star (Orthasterias koehleri) a large and small one with regenerating arms, Pacific northwest coast of North America

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

Flip Nicklin / Sea Star with Red Shrimp, Baffin Island, Canada

Flip Nicklin / Sea Star, Coral Polyps and anemones, underwater, Admiralty Inlet, Baffin Island, Canada

Norbert Wu / Crown-of-thorns Starfish (Acanthaster planci) are cleared by Ron Leidich since they damage coral reefs, cause of population explosion is unknown, Palau

Norbert Wu / Limpet (Diodora aspera) escapes sucking arms of Starfish (Pisaster giganteus) by exuding slippery mantle, Monterey, California, sequence 3 of 3

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