Leopard Slug

The Great Grey Slug (dark grey with whitish spots) can grow to 20 cm long, with a keel, or raised ridge, that runs about a third of the way along its back from the rear. It also has a 'fingerprint' pattern of raised ridges on the mantle. The pulmonary aperture opens on the right-hand side, near the back of the mantle.

The mating ritual involves two slugs climbing onto something high, usually a twig, then lowering themselves on a rope of slime. They then intertwine, in mid-air, and extrude their genitalia to exchange sperm.