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The most popular leech, because of its use in the medical field is the Hirudo medcinalis. After attaching to a host, the leech can fill itself in about 45 minutes, expanding up to twelve times its original size in blood! On that full belly the leech can survive up to 6 months. Giving the optimal conditions... a leech only feeds twice a year!

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10y ago
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15y ago

All their lives, I suppose. Exept blood sucking leaches who are above water when sucking blood, and when they are done I think they crawl back into the water.

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13y ago

Leeches can live in 40F to 80 F (5-27 C)

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12y ago

never human does not without water

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Q: How long do leeches stay alive without food?
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