Gastropoda

snails and slugs
Gastropoda
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Pickerel Lake, Pinckney State Recreation Area, Michigan
Slime trails are a good way to identify slugs and snails. When they cross over objects, their moist and gooey bodies will leave a trail of slime. If the trail dries out, it can become flaky and take on a more whitish color.
Tanya Dewey (photographer, copyright holder, identification), Animal Diversity Web, University of Michigan Museum of Zoology