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They release enzymes onto earthworms, causing them to slowly dissolve, and then the hammerhead worm ingests the liquefied earthworm. (As an interesting side note, the way that hammerhead worms prey on earthworms is fairly disturbing. One hammerhead worm isn’t going to destroy a garden obviously, especially because their negative impact is indirect, but they should be removed from the gardens they are found in for the sake of the earthworms. Hammerhead worms aren’t dangerous to humans or pets, and they also don’t damage plants, but they feed on the gardener’s best friend, the earthworm, and this can be harmful to your garden because of the vital role earthworms play in aerating soil. After describing the worm, she asked “who is this?”, which could be related to her use of the phrase “worm-like being.”) However, we’ll at least explain why we think our reader found a hammerhead worm, and we’ll also link to some of the several articles we have written about this creature in case our reader is interested in learning more about what she (likely) found.īefore anything, though, we should note that although our reader didn’t express any worry about the worm she found, she has at least one reason to be concerned: she found the worm in her garden, and hammerhead worms do not make good additions to gardens. Technically, we could end our response here, as the reader was only interested in what she found. If this is true, we have a pretty good idea what our reader found: a hammerhead worm (sometimes spelled “hammer head worm”). A couple of days ago we received a question from a reader in Northern California who found a six-inch “worm-like being with black horizontal stripes and a flat, fan-shaped head.” By “fan-shaped head,” we are assuming our reader means the worm’s head is, first, clearly distinct from the rest of its long, striped body and, two, somewhat flat and spread out, perhaps in half-circle shape.