Yes—but only sometimes. Smithsonian Ocean reports that the bobbit worm can split fish prey with its sharp teeth during a rapid ambush. It spends most of its time hidden in sand, waiting for prey to pass, rather than chasing fish in the open.
What is a bobbit worm?
The bobbit worm is the common name for Eunice aphroditois, a marine bristle worm in the polychaete family Eunicidae. Smithsonian’s collection record lists its classification as Animalia, Annelida, Polychaeta, Eunicida, and Eunicidae; that record was last modified on September 28, 2022. (Smithsonian collection record)
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Its appearance is striking: a long, segmented body and five antennae that can protrude above the sediment while the rest of the animal remains concealed. Smithsonian Ocean describes it as a couple of inches wide and up to ten feet long. That ten-foot figure is a reported maximum, not a typical size. (Smithsonian Ocean, October 2015)
How does it catch fish?
- It waits out of sight. The worm stays beneath sand or in a burrow, with its sensory antennae exposed.
- It detects prey overhead. When a fish or other prey passes within reach, the antennae help the worm sense it.
- It strikes and grips. The worm lunges quickly and seizes prey with strong jaws and sharp teeth.
- It pulls prey toward cover. A peer-reviewed study describes the worm grabbing and tearing prey into its burrow. (Smithsonian Magazine, 2015; 2016 study)
Smithsonian Ocean says the worm sometimes splits fish prey in half with its teeth. “Sometimes” matters: the source documents an occasional outcome, not a guaranteed result of every strike. (Smithsonian Ocean)
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Can fish detect the hidden worm?
They can respond to it. A 2016 peer-reviewed study reports fish directing sharp jets of water toward a concealed Eunice aphroditois, a behavior consistent with fish detecting and mobbing the predator. It does not mean the worm is always visible or that every fish reacts this way. (Royal Society Open Science study, 2016)
How large can it get?
Smithsonian Ocean and Smithsonian Magazine report bobbit worms reaching about ten feet long. Smithsonian Ocean also gives a width of a couple of inches. These are upper-size descriptions in those accounts; they do not establish how large an average individual is. (Smithsonian Ocean; Smithsonian Magazine)
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What does the ancient fossil burrow tell us?
A 2021 Scientific Reports paper interprets a roughly 20-million-year-old fossilized burrow trace as the lair of an ancient ambush predator and discusses living bobbit worms as a modern analogue. The trace is evidence about an ancient burrow and its likely use—not a preserved body of a bobbit worm, or proof that the modern species itself is 20 million years old. (Scientific Reports, 2021)
What is known about its toxin and risk to people?
Smithsonian Ocean says the worm injects prey with a toxin that helps break down food for digestion. The cited account does not identify the toxin’s composition or potency, and it does not establish whether contact poses a risk to people. Claims that bobbit worms are either dangerous or harmless to humans go beyond these sources. (Smithsonian Ocean)
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Smithsonian Magazine reports that curator Terry Gosliner named the worm after the actions of Lorena Bobbit, while describing the origin of the species name as uncertain. This is the magazine’s account of the common name, rather than a definitive explanation of the scientific name. (Smithsonian Magazine, 2015)
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