Snails and slugs belong to a large family of animals known as molluscs. Slugs live in damp places in the soil and among debris, and emerges only at night or on wet days. Interestingly, slugs are hermaphrodites!
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Slugs usually come from dark, moist areas like under logs, rocks, and porches. They will venture out when there's enough moisture for them to get around well.
A modern shotgun slug is a heavy lead or copper-covered lead projectile, with or without a plastic tip, that may have what appears to be rifling, but these are special cuts in the slug to let it deform...