Steve Downer / Close up of a Black slug (Arion ater agg.) feeding on a Plantain lily (Hosta) leaf, Birmingham, England, UK, August.
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Steve Downer / Black slug (Arion ater agg.) feeding on a dead Yellow slug (Limax flavus), Birmingham, England, UK, August.
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Steve Downer / Black arion slug (Arion ater) moving, viewed from beneath showing ripples or pedal waves used for locomotion.
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Nick Upton / 2020VISION / Black slug (Arion ater), brown form, crawling over patio after rain, with house and garden bench in the background, Wiltshire, UK, July . Property released.
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Martin Dohrn / Red forms of Black slug {Arion ater} mating, Northern Italy, Europe
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Jason Smalley / Close-up of Slug {Arion ater rufus} feeding on leaf, UK
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Cyril Ruoso / Black slug (Arion ater) eating Cuckooflower (Cardamine pratensis), close up. Yonne, Bourgogne-Franche-Comte, France. April.
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Robin Chittenden / Boy observing Black slug (Arion ater), brown form. Norfolk, UK. September 2017.
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Adrian Davies / Slug (Arion ater agg) mating pair with sperm mass, Surrey, England, UK. August.
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Steve Downer / Close up of a Black slug (Arion ater agg.), showing penis, England, UK, October.
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Steve Downer / Close up of a penis of a Black slug (Arion ater agg.), England, UK, October.
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Steve Downer / Pair of Black slugs (Arion ater agg.) mating, showing external sperm transfer, Birmingham, England, UK, October.
