Embryo Dune – This is the youngest and smallest stage of a sand dune, mostly made of bare sand facing the sea but contains pioneer species like sand couch grass and lyme grass that help stabilise the sand with their long roots. These dunes are affected by strong winds and winter tides.
Mobile Dune – These are the dunes directly behind the embryo dunes standing a few metres taller being colonised by Marram grass with less exposed sand and more resilient to storms. These can normally last a few years.

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