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I didn’t write the following, just cut and pasted: “In slugs it is often impossible to distinguish closely related species using external features and so reliable identification requires dissection to examine the genitalia. Slugs produce two types of mucus: one is thin and watery, and the other thick and sticky. Some species of slug secrete slime cords to suspend a pair during copulation. In the banana slugs, the penis sometimes becomes trapped inside the body of the partner. Apophallation allows the slugs to separate themselves by one or both of the slugs chewing off the other's or its own penis.”