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Black slug.jpg

Like other terrestrial slugs, the black slug (Arion ater), also known as the black arion, European black slug, or large black slug, is a hermaphrodite, preferring to find a mate—often several—but can self-fertilize. After mating, the black slug seeks a dark, moist environment such as beneath mosses—occasionally within topsoil—to lay its eggs about 5mm (0.2 in) in diameter. Between August and October, an individual slug lays up to 150 eggs every one to three weeks—clutches diminishing to 20 eggs late in the season. Juveniles hatch after at least twenty-seven days, hatching later under cold temperatures. Maturation takes up to nine months, enabling mating in early summer. Black slugs die shortly after laying its last clutch, rarely surviving into a second year.