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.

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...