Witness a snail scraping microbial films from the inside of an aquarium. Go back 505 million years, and this looks to have been the way an enigmatic early animal made its living (but without the aquarium).
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Bengtson, S. A ghost with a bite. Nature 442, 146–147 (2006). https://doi.org/10.1038/442146a
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DOI: https://doi.org/10.1038/442146a
