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Photographer: Maggie Douglas
The Marsh slug, Deroceras laeve, appears to be mostly a native species though there are some populations that appear to have come from elsewhere. This species can be found in crop fields, but is not often associated with significant economic damage. This species is known to be an pest in greenhouses and of some horticultural crops. It can be discriminated from the gray garden slug because its defensive slime is clear, not milky.