Smithsonian Magazine on MSN
Leeches May Be 200 Million Years Older Than We Thought—and Haven’t Always Sucked Blood
The Wisconsin site is famed for its preservation of ancient soft-bodied organisms like leeches—leading Kenneth Gass, a ...
A 430-million-year-old fossil has rewritten leech history, showing they are at least 200 million years older than previously believed. Unlike today’s bloodsucking leeches, their ancient ancestors ...
How do leeches find their hosts? We explore how leeches sense heat, chemicals, and movements in their environments.
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