A creepy-crawly invasive species known as the hammerhead worm is reappearing in Texas, following several weeks of excessive rainfall. The hammerhead worm, a ground-dwelling flatworm, is lethal to ...

WASHINGTON — Earthworms, as we know, are garden champions, cleaning the soil by eating their weight in organic matter every day and aerating it as they wriggle around, creating tunnels to ease root ...

Thanks to the half-moon shape of their heads, hammerhead worms are known by many names, including hammerhead flatworm, arrowhead flatworm, and broadhead planarian (a category of flathead worms).

Hammerhead flatworms — an invasive pest that looks like a cross between a hammerhead shark and a leech — have been spotted in the Washington, D.C., area and across the United States. Experts say the ...