Like snails, slugs have two pairs of 'feelers' or tentacles
on their head. The upper pair--optical tentacles--are
light sensors; the lower pair provides the sense of smell.
Both pairs are retractable and can be regrown if lost.
On top of the slug, behind the head, is the saddle-shaped
mantle, and under this are the genital opening and anus.
The mantle also has a hole, the pneumostome, for respiration.
The slug moves by rythmic muscular action of its foot.
Most slugs eat leaves, fungus, and decaying vegetable
material, but some are predators and most also eat carrion
including dead of their own kind. Slugs eat using a radula,
a rough, tongue-like organ with many tiny tooth-like denticles.
Slugs produce two types of mucus: one which is thin and
watery, and another which is thick and sticky
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