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November 30, 2010
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Physical features

The soft body of a snail is usually protected by a shell. The animal crawls along on a muscular organ called a foot. The muscles in the foot move backwards in a wave-like action. This action moves the snail forwards. Snails have a head with tentacles, or feelers, eyes, a mouth and tiny teeth . All land snails breathe through lungs. Most water-living snails breathe through gills, like fish. Some have lungs and must come to the surface of the water to breathe. The smallest snail is no larger than a pin-head. The largest can grow to 77 centimeters long!
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Slug

Slug is a common name that is normally applied to any gastropod mollusc that lacks a shell, has a very reduced shell, or has a small internal shell. This is in contrast to the common name snail, which is applied to gastropods that have coiled shells that are big enough to retract into. Slugs belong to several different lineages that also include snails with shells. The shell-less condition has arisen many times independently during the evolutionary past, and thus the category "slug" is emphatically a polyphyletic one. The various groups of land slugs are not closely related, despite a superficial similarity in the overall body form. As well as land slugs, there are also many marine slugs and even one freshwater slug species, but the common name "slug" is most frequently applied to air-breathing land slugs, while the marine forms are usually known as sea slugs. Land gastropods with a shell that is not quite vestigial, but is too small to retract into (like many in t...
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European pulmonate land snail, which has been introduced to many other countries

European pulmonate land snail, which has been introduced to many other countries 
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