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 found a 430-million-year-old leech fossil, Macromyzon siluricus. It shows leeches first lived in oceans and did ...

The Wisconsin site is famed for its preservation of ancient soft-bodied organisms like leeches—leading Kenneth Gass, a ...