A 437-million-year-old fossil from a deposit in Wisconsin could be the oldest species of leech ever found. By Jack Tamisiea If you look around Waukesha County in Wisconsin today, it can be difficult ...

WALKER, Minn. — Minnesota's third-largest lake has a namesake only an angler could love: the leech. Earthworm's ugly aquatic cousin. Those slimy, crawly creatures straight out of a horror film. But ...

This video taken in Madagascar in 2017 shows a Chtonobdella leech taking a small jump followed by a big leap to the ground. A new study presents video evidence that at least one species of terrestrial ...