Go to a rocky West Coast beach at low tide, and you’ll see a constellation of small, glassy pools of water, the residual ocean left behind when it was tugged away by the moon. These pools are an ecotone, the space where two habitats — ocean and shore — collide, and they are rich in biodiversity. Peer past the mirror of the water’s surface, and you’ll find a forest of algae and sponges sheltering sea stars, urchins, anemones, baby fish and more.
The giant green anemone, Anthopleura xanthogrammica, is one of the most ubiquitous tide pool denizens, emerald and starry and found from Baja California to Alaska. At first glance, it seems more plant than animal, an electric green sunflower waving its petals beneath the glassy water. But those petals are in fact tentacles, six or more rings of them, which the creature uses to pull food into its central mouth. It has a columnar body rather than a stem, and no roots, only a foot it uses to cling to a rocky surface. A giant green anemone hardly ever relocates once it finds a suitable home.
When the tide goes out, exposing an anemone, the creature curls up upon itself, gathering its arms into its center, like a yellow dandelion closing to the night. The giant green anemones that cling to the sides of rocks droop when closed — bulbous gelatinous gargoyles. Those on horizontal surfaces turn to orbs. When closed, an anemone can survive the harsh drought of low tide, waiting for long hours between visits from the sea.
When the tide returns, the anemone unfurls, each tentacle waving independently in the water like a dancing ribbon. It’s a deadly beauty: The tentacles are armed with stinging cells, ready to grasp its prey and inject it with neurotoxic venom.
A brief list of creatures the giant green anemone considers food: bushels of California mussels, prized from the rocks by beating waves. Sea urchins, crabs, barnacles, their hard indigestible shells spit out from the same mouth that took them in, flecks adorning an anemone’s sticky surface like oversized glitter. Marine worms and small fish, snatched from the water while swimming or scooting past. And, at least twice on record along the Oregon coast, juvenile birds, a cormorant and a gull that died in their nests and tumbled off the cliffs into the waiting maw of an anemone.
Up against the anemone’s stinging cells, or cnidae — pronounced without the c, like the stinging nettles they are named for — few creatures stand a chance. A single anemone body will have hundreds of tentacles, each with tens of thousands of tiny cnidae. When prey brush against a tentacle, each cnida harpoons out an even tinier organelle that pierces the prey and shoots out a little capsule containing venom. Brush a tentacle with your finger, and it feels like Velcro, a little hug of barbs trying to pierce your hand but unable to find purchase through the leather of your skin. But if the prey is soft-bodied, unprotected — a naked mussel, for example — I imagine the anemone delivers brief agony before complete immobility sets in, destiny locked into place.
The giant green anemones that cling to the sides of rocks droop when closed — bulbous gelatinous gargoyles.
The only part of the human body a giant green anemone can sting is the tongue. The hands, the arms, the feet, the face: The rest of the body is invulnerable to this flowery sea creature’s stinging cells. But the tongue — that seat of the voice, of speech and song, of noises sparked by joy and laden with sorrow — is tender, unprotected, naked. You are open to risk and pain and barbs if you’re willing to lower it to the sea.
I did it, once. It was a dare by a marine biologist friend. On a cold and windy evening on the Oregon coast, the sun setting orange and pink over the ocean, I knelt beside a rocky pool. In an act of giddy benediction, I opened my mouth and pressed my tongue gently to a giant green anemone, the strangest kiss I’d ever shared. At first there was the familiar hug, the needle press of tentacles — then a piercing, the strangest buzz, a stinging vibration coursing through my mouth.
That feeling stayed for half an hour, a zinging along the tip of my tongue. A little bit of electricity, passed from the anemone to me.
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This article appeared in the June 2026 print edition of the magazine with the headline “How to touch a star.”
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