Some mud is too soft for Hydrobia ulvae to crawl on, but they may be overlooked when they lie buried with just their heads and feet protruding to feed on the surrounding surface. Several were found in this mud on the Severn Estuary.

Submitted by Ian Smith on Tue, 30/08/2011 21:46
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I.F. Smith
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Much of the mud on the Severn Estuary is too soft for Hydrobia ulvae to crawl on, but they may be overlooked when they lie buried with just their heads and feet protruding to feed on the surrounding surface. Several were found in this wet mud near high water mark at Littleton Warth where the glistening bodies were initially mistaken for Limapontia depressa sea slugs.