There are about seven species of slugs that are garden pests. They can do damage throughout the year on a wide range of plants, but seedlings and new growth on herbaceous plants in spring are most at risk and may need protection. Most slugs live in or on the soil surface, but keeled slugs (Milax species) live and feed mostly in the root zone. Slugs vary in size from the smaller Deroceras reticulatum (grey field slug, buff coloured form, right), which is no more than 5cm (2in) long, to Arion ater (large black slug, left), which can be 12cm (5in) when fully extended. Some slugs vary in colour; Arion ater can be black, orange brown or buff coloured. Warmer weather combined with damp conditions greatly increases their activity.
Slugs remain active throughout the year, unlike snails, which are dormant during autumn and winter. Reproduction occurs mainly in autumn and spring, when clusters of spherical, yellowish-white eggs can be found under logs, stones and pots.
Slugs are most active after dark or in wet weather.
Eaten by Slugs 
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