Nick Hawkins / A group of frilled anemones (Metridium senile) off Bonaventure Island in the Gulf of Saint Lawrence, Quebec, Canada. September.

Nick Hawkins / Frilled anemones (Metridium senile) growing off Bonaventure Island in the Gulf of Saint Lawrence, Canada. September.

Nick Hawkins / A common spider crab, (Libinia emarginata) camoflages among a group of frilled anemones (Metridium senile) off Bonaventure Island in the Guld of Saint Lawrence, Quebec, Canada. September.

Nick Hawkins / Frilled anemones (Metridium senile) growing amonst sponges off Bonaventure Island in the Gulf of Saint Lawrence, Quebec, Canada. September.

Nick Hawkins / A group of frilled anemones (Metridium senile) and various invertebrates growing off Bonaventure Island in the Gulf of Saint Lawrence, Quebec, Canada. September.

Franco Banfi / Plumose anemone (Metridium senile), Alaska, North Pacific Ocean.

Franco Banfi / Plumose anemone (Metridium senile), Alaska, North Pacific Ocean.

SCOTLAND: The Big Picture / Edible crab (Cancer pagurus) sitting between hydroids (Nemertesia ramosa) and Plumose anemone (Metridium senile) with fish swimming in plankton bloom in background, South Arran Marine Protected Area,...

SCOTLAND: The Big Picture / Elegant anemone (Sagartia elegans) and Plumose anemone (Metridium senile) with fish swimming in plankton bloom in background, South Arran Marine Protected Area, Isle of Arran, Scotland, UK, August.

SCOTLAND: The Big Picture / A rocky reef covered in anemones such as Plumose anemone (Metridium senile), starfish, sponges and seaweed, with fish swimming in plankton bloom in background. South Arran Marine Protected Area, Isle...

SCOTLAND: The Big Picture / Elegant anemone (Sagartia elegans) and Plumose anemone (Metridium senile) with fish swimming in plankton bloom in background, South Arran Marine Protected Area, Isle of Arran, Scotland, UK, August.

MYN / Jerry Monkman / Frilled anemone (Metridium senile) on Blue mussel (Mytilus edulis). Rye, New Hampshire, USA, August. meetyourneighbours.net project

MYN / Jerry Monkman / Frilled anemone (Metridium senile) on Blue mussel (Mytilus edulis). Rye, New Hampshire, USA, August. meetyourneighbours.net project

Norbert Wu / Spotted Ratfish (Hydrolagus colliei) usually a deep dwelling fish, Alaska

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 / Quillback Rockfish (Sebastes maliger) amid Frilled Sea Anemones (Metridium senile), the fish live to 95 years, late sexual maturity makes them vulnerable to overfishing, Alaska

Scott Leslie / Frilled Sea Anemone (Metridium senile) group, Nova Scotia, Canada

Scott Leslie / Frilled Sea Anemone (Metridium senile) group showing extended tentacles, Nova Scotia, Canada

Jeff Rotman / Mouth of Frilled Metridium Anemone (Metridium senile). New England, USA, Atlantic Ocean.

Norbert Wu / Frilled Sea Anemone (Metridium senile) and Sea Urchin, Queen Charlotte Islands, Canada

Fred Bavendam / Frilled Sea Anemone (Metridium senile) surrounded by genetic clones of an Orange Frilled Sea Anemone, British Columbia, Canada

Fred Bavendam / Frilled Sea Anemone (Metridium sp) growing on shallow rocks near the south end of Browning Pass affected by ocean currents, British Columbia, Canada

Fred Bavendam / Lion's Mane (Cyanea capillata) jellyfish ensnared by a Frilled Sea Anemone (Metridium senile), British Columbia, Canada

Norbert Wu / Frilled Sea Anemone (Metridium senile) field with sea star at base, southeast Alaska

Norbert Wu / Frilled Sea Anemone (Metridium senile) group, Leather Star (Dermasterias imbricata) and Orange Sun Star (Solaster stimpsoni), Vancouver Island, British Columbia, Canada

Norbert Wu / Frilled Sea Anemone (Metridium senile) group, Giant Green Sea Anemones (Anthopleura xanthogrammica) and Ochreous Starfish (Pisaster ochraceus), Vancouver Island, British Columbia, Canada

David Fleetham / Orange plumose anemone (Metridium senile) on seabed, British Columbia, Canada, Pacific Ocean.

Alex Mustard / Red soft coral (Eunephthya rubiformis), Yellow encrusting sponges (Myxilla lacunosa) and Plumose anemones (Metridium senile) growing on reef wall, Browning Pass, Vancouver Island, British Columbia, Ca...

Alex Mustard / Scalyhead sculpin (Artedius harringtoni) resting among tentacles of Plumose anemones (Metridium senile), Browning Pass, Vancouver Island, British Columbia, Canada, Queen Charlotte Strait, Pacific Ocea...

Alex Mustard / Wolf eel (Anarrhichthys ocellatus) male, resting among Plumnose anemones (Metridium senile), Vancouver Island, British Columbia, Canada, Queen Charlotte Strait, Pacific Ocean.

Alex Mustard / Lingcod (Ophiodon elongatus) resting on a reef covered with Plumose anemones (Metridium senile), Browning Pass, Vancouver Island, British Columbia, Canada, Queen Charlotte Strait, Pacific Ocean.

Alex Mustard / Sharpnose crab (Scyra acutifrons) feeding on passing particles, whilst hiding in a gap between a White short plumose anemone (Metridium senile) and a Yellow encrusting sponge (Myxilla lacunosa), Brown...

Alex Mustard / Scalyhead sculpin (Artedius harringtoni) resting on Short plumose anemones (Metridium senile) in front of Yellow encrusting sponges (Myxilla lacunosa), Browning Pass, Vancouver Island, British Columbi...

Alex Mustard / Red Irish lord (Hemilepidotus hemilepidotus) camouflaged on reef with White short plumose anemones (Metridium senile), Browning Pass, Vancouver Island, British Columbia, Canada, Queen Charlotte Strait...

Alex Mustard / Red Irish lord (Hemilepidotus hemilepidotus) camouflaged amongst Red soft coral (Eunephthya rubiformis) and Yellow encrusting sponges (Myxilla lacunosa) with White plumose anemones (Metridium senile)...

Shane Gross / Plumose anemones (Metridium senile) hanging from a dock piling at low tide, Bamfield, Vancouver Island, British Columbia, Canada.

Shane Gross / Plumose anemones (Metridium senile) hanging from a dock piling at low tide, Bamfield, Vancouver Island, British Columbia, Canada.

Shane Gross / RF - China rockfish (Sebastes nebulosus) hiding behind Red soft coral (Eunephthya rubiformis) and Plumose sea anemones (Metridium senile), Browning Pass, British Columbia, Canada, Pacific Ocean. (This...

Joel Sartore / Photo Ark / Powder puff anemone (Metridium senile) on black background, Indianapolis Zoo.

Franco Banfi / Scuba diver swimming over Plumose sea anemone (Metridium senile), Trondheimsfjord, Norway, Atlantic Ocean.

Franco Banfi / Plumose sea anemone (Metridium senile) on seabed, Trondheimsfjord, Norway, Atlantic Ocean.

Shane Gross / Scalyhead sculpin (Artedius harringtoni) hiding amongst Plumose anemone (Metridium senile), Browning Pass, Queen Charlotte Strait, Vancouver Island, British Columbia, Canada.

Shane Gross / Reef scene including red soft coral (Gersemia rubiformis), Giant plumose anemone (Metridium senile) and Bull kelp (Nereocystis luetkeana), Vancouver Island, British Columbia, Canada, Pacific Ocean.

David Hall / Acorn barnacles (Semibalanus cariosus) and (Balanus glandula), Mussels (Mytilus sp.), and Plumose anemones (Metridium senile) underwater at high tide, Seven Tree Island, Browning Pass, Queen Charlotte...