What is the difference between coastal and littoral?

What is the difference between coastal and littoral?

If an animal is coastal, it means that it lives on or near the coast. 

A ‘coastal zone’ is the area where the ocean water, or sea water, meets the land. It includes sea cliffs, mud flats, and shoreline rocks and ledges. In the ocean, the coastal zone extends to the continental shelf (and the air above it), before the ocean becomes deeper. On land, there are many definitions, such as the low-water line marked officially on a map or the number of kilometres or miles designated by the laws of the country, such as 5-38 kilometres (3-24 miles) inland. Some scientists think that there should not be territorial or boundary limits on the definition of a coastal zone.

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Common Periwinkle

The Common Periwinkle (Littorina littorea) is a small marine (saltwater) gastropod mollusc in the Littorinidae family of whelks and sea snails. 

The Common Periwinkle has a thick, dark, grey-brown shell, that is sometimes banded. The inside of the shell is chocolate brown. It has 6-7 whorls. It has gills that enable it to breathe underwater. It has a lid on its shell, called an operculum. 

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