Learn about a 480-million-year-old leech fossil that revealed that ancient leeches didn’t have the biological components necessary to suck blood. It’s the beginning of the spooky season, which means ...

The medium-sized leech can move in an S-shape to swim and crawl like an inchworm on dry land, researchers said. Photo by 杨 震 via Unsplash For months, researchers returned to a single cave in southern ...