The first time I was bitten by a leech, I was swimming in a West Virginia river. I remember the scene perfectly: I crawled ...

Meet the leech, the misunderstood hero of aquatic ecosystems all over the world, who does not always suck blood!

How do leeches find their hosts? We explore how leeches sense heat, chemicals, and movements in their environments.

A newly described fossil reveals that leeches are at least 200 million years older than scientists previously thought, and ...

Scientists have also long thought that the earliest leeches were bloodsuckers. All modern leeches, including species that do ...

The fossil leech compared with a modern leech. Double arrows indicate the large caudal sucker used for attachment, single arrows indicate body annulations. A newly described fossil reveals that ...