Before they sucked blood, leeches were ocean hunters

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 likely hunted small marine animals using a tail sucker rather than piercing skin.

from All Top News -- ScienceDaily https://ift.tt/iB61pjZ