A unique species of snail has been discovered in the Negev Desert.At night,these snails use a toothlike rasping organ in their head to scrape up porous limestone; they then digest the algae that lived in the rock pores.This scraping organ is the

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The radula is a specialized feeding organ in mollusks, including snails, used to scrape or cut food before ingestion.

A Unique Species of Snail Has Been Discovered in the Negev