Alex Mustard / Portrait of a Red Sea anemonefish (Amphiprion bicinctus) above the tentacles of a Magnificent sea anemone (Heteractis magnifica) on a coral reef. Daedelus Reef. Egypt. Red Sea.

David Fleetham / Day octopus (Octopus cyanea) female, in mid-water, Hawaii.

Nick Upton / White-lipped snail (Cepaea hortensis) crawling over an oak sleeper retaining a garden lawn with a greenhouse in the background, Wiltshire, UK, April.

Nick Upton / Garden snail (Cornu aspersum / Helix aspersa) crawling over an oak sleeper retaining a garden lawn with buildings and a greenhouse in the background, Wiltshire, UK, April.

Shane Gross / Common octopus (Octopus vulgaris) hunting on a reef off Eleuthera Island, Bahamas.

SCOTLAND: The Big Picture / Close up of a colony of Jewel anemones (Corynactis viridis) Scotland, UK, October.

Alex Mustard / Lion's mane jellyfish (Cyanea capillata) with feeding tentacles spread swimming in the sun in shallow water. Gulen, Norway. North East Atlantic Ocean.

Franco Banfi / Beak and tentacles of Humboldt squid (Dosidicus gigas) at night off Loreto, Sea of Cortez, Baja California, Mexico, East Pacific Ocean.

Jordi Chias / Atolla jellyfish (Atolla wyvillei) with Gentoo penguin (Pygoscelis papua) in the background near the surface. Antarctic Peninsula. Finalist in the Underwater category of the Wildlife Photographer of t...

Solvin Zankl / Deepsea Basket star (Gorgonocephalus lamarckii) specimen, from the North Atlantic near Iceland.

Solvin Zankl / Deepsea Octopus (Bathypolypus bairdii) specimen from the North Atlantic, near the Faroe Islands at a depth of 805m

Solvin Zankl / Deep sea squid (Histioteuthis corona) specimen, from deep sea Atlantic Ocean.

Solvin Zankl / Portuguese Man-of-War (Physalia physalis) close up of tentacles, Sargasso Sea, Bermuda

Alex Mustard,Alex Mustard / Red eye medusa (Polyorchis penicillatus) with its feeding tentacles extended to catch planktonic prey. Note that the bell of the jelly has hitchhiking amphipods (Hyperia medusarum). Browning Pass, Van...

Franco Banfi / Detail of magnificent Sea anemone (Heteractis magnifica) Maldives, Indian Ocean

Ben Hall / 2020VISION / Close-up of the tentacles of a Sundew (Drosera rotundifolia), with secretions of mucilage, Peak District NP, August 2011. 2020VISION Exhibition.

Alex Mustard / 2020VISION / Leach's spider crab (Inachus phalangium) sheltering from the current beneath tentacles of Snakelocks anemone (Anemonia viridis) Selsey, West Sussex, UK, May

Pete Oxford / Upside down Jellyfish (Cassiopeia sp) Jardines de la Reina National Park, Cuba, Caribbean

Brandon Cole / Tentacles of the Giant Sea Anemone (Condylactis gigantea). Dominica, Caribbean Sea, January.

Brandon Cole / Pacific Giant Octopus (Enteroctopus dofleini) tentacles while swimming. British Columbia, Canada, Pacific Ocean, September.

Juergen Freund / Wonderpus (Wunderpus photogenicus) Indo-pacific.

Georgette Douwma / Bubble Tip Anemone (Entacmaea quadricolor). The tentacles are usually a dull brown, but this anemone is partially bleached and has lost most of the endosymbiotic zooxanthellae. Raja Ampat, West Papua,...

Juergen Freund / True clownfish / Clown anemonefish (Amphiprion percula) amongst tentacles of anemone on reef, West New Britain, Papua New Guinea.

Juergen Freund / Blue-ringed octopus (Hapalochlaena lunulata) swimming through water, Batangas, Philippines

Juergen Freund / Orange cup coral (Tubastrea faulkneri) with polyps open, Batangas, Philippines.

Juergen Freund / Orange cup coral (Tubastrea faulkneri) detail of mouth and tentacles, Batangas, Philippines.

Juergen Freund / Pink anemonefish (Amphiprion perideraion) hiding amongst the tentacles of its closed anemone host, Kimbe Bay, West New Britain, Papua New Guinea.

Juergen Freund / Details of mouth of an anemone, Kimbe Bay, West New Britain, Papua New Guinea.

Juergen Freund / Spine-cheek anemonefish (Premnas biaculeatus) with baby amongst anemone tentacles, Bali, Indonesia, Indo-pacific.

Juergen Freund / Sea apple (Pseudocolochirus violaceus) with tentacles exposed, feeding, Komodo NP, Indonesia, Indo-pacific.

Suzi Eszterhas / Sea Nettle (Chrysaora quinquecirrha / achlyos) Monterey Bay Aquarium, California, USA, Captive

Suzi Eszterhas / Two Purple / Striped Jellyfish (Pelegia / Chrysaora colorata) Monterey Bay Aquarium, California, USA, Captive

Stephen Dalton / Green Hydra (Hydra viridis) with tentacles extended. UK, November.

Stephen Dalton / Green Hydra (Hydra viridis) with tentacles extended. UK, November.

Juergen Freund / Clark's anemonefish / Yellowtail clownfish (Amphiprion clarkii) prreing out from anemone tentacles. Misool, Raja Ampat, West Papua, Indonesia.

Juergen Freund / True clownfish / Clown anemonefish (Amphiprion percula) tending its eggs. Misool, Raja Ampat, West Papua, Indonesia

Juergen Freund / Coconut / Veined octopus (Octopus marginatus) in its shell home. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / Poison ocellate octopus (Octopus mototi) on seabed. Lembeh Strait, North Sulawesi, Indonesia

Juergen Freund / Schooling Banggai cardinalfish in anemone tentacles. (Pterapogon kaudemi). Lembeh Strait, North Sulawesi, Indonesia

Juergen Freund / Wonderpus (Wonderpus photogenicus) swimming well above the sea bed. Lembeh Strait, North Sulawesi, Indonesia.

Juergen Freund / True clownfish / Clown anemonefish (Amphiprion percula) tending its eggs. Misool, Raja Ampat, West Papua, Indonesia0

David Shale / Hydromedusa / Trachymedusa (Crossota sp) showing tentacles, from approx 2700m, mid Atlantic ridge, June 2010

Brandon Cole / Pacific Giant Octopus (Enteroctopus dofleini), close-up of suckers on tentacles. aquarium shot, captive

Wild Wonders of Europe / Lundgren / Anemone (Urticina eques) close-up, Saltstraumen, Bod??orway, October 2008

Wild Wonders of Europe / Lundgren / Plumose sea anemone (Metridium senile) close-up, Saltstraumen, Bod??orway, October 2008