An invasive species of worm that can harm local ecosystems was recently discovered at a park in the St. Louis area.

Hammerhead worms. They're here. Possibly somewhere out there under rocks and leaf litter after heavy rain.

Hammerhead worms look odd and keep turning up in Mississippi. Experts say don’t touch — and definitely don’t cut — this invasive species.

USDA tracking more cases of flesh-eating worm in the U.S., 6 cases in Texas

An invasive hammerhead worm was recently found in south St. Louis County at Cliff Cave Park, officials say.

Hammerhead worms are an invasive species of land flatworms that feed on earthworms and slugs, according to the Mississippi State University Extension. They have flat, long bodies that can reach up to a foot in length and have “cobra-like” heads, experts said.

In a proof-of-concept lab experiment, scientists demonstrated that intestinal parasites could make and release therapeutic agents inside a living host.

"I thought I was fine with all the creepy crawlies I see in the garden. I was wrong."