Spotting a long, flat worm gliding across your garden or patio can be startling—and if it has a wide, hammer-shaped head, you’re likely looking at a hammerhead worm. These unusual creatures have become more common in recent years, and understanding them is key to keeping both your garden and yourself safe.
Meet the Hammerhead Worm
Hammerhead worms are land flatworms from the Bipalium genus, instantly recognizable by their broad, shovel-like heads. Their sleek, smooth bodies often sport dark stripes or muted browns and grays. Unlike earthworms, they glide instead of wriggling, thanks to tiny cilia that help them move fluidly across damp surfaces.
Origins and Habitats
Originally from Southeast Asia, hammerhead worms have spread worldwide through soil and plant transport. They thrive in shady, moist areas—gardens, patios, under rocks, or any damp space—and are particularly active after rainfall.
Behavior and Diet
These worms are predators, feeding mainly on earthworms. While harmless to humans in terms of bites or attacks, their mucus contains tetrodotoxin, which can irritate skin. Always avoid direct contact—gloves or tools are essential when handling them.
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