Ingo Arndt / Lugworm (Arenicola marina) holes during low tide, Sylt Island, North Sea, Germany

Philippe Clement / European Lugworm {Arenicola marina} cast of defaecated sediment, North Sea, Belgium

Philippe Clement / European Lugworm {Arenicola marina} burrows showing the characteristic depression at the head ends (blow hole) and a cast of defaecated sediment at the tail ends, North Sea, Belgium

Philippe Clement / European Lugworm {Arenicola marina} burrow showing the characteristic depression at the head end (blow hole) and a cast of defaecated sediment at the tail end, North Sea, Belgium

Philippe Clement / European Lugworm {Arenicola marina} burrow showing the characteristic depression at the head end (blow hole) and a cast of defaecated sediment at the tail end, North Sea, Belgium

Sue Daly / Lugworm cast (Arenicola marina) Jersey, Channel Isles, UK

Ingo Arndt / Lugworm (Arenicola marina) three centimeters, Helgoland, Germany

Willem Kolvoort / Sand excrements from Lugworm (Arenicola marina), White Sea, Russia

Roger Powell / Eurasian curlew (Numenius arquata) catching Lugworm (Arenicola marina). Lindisfarne National Nature Reserve, Northumberland, UK. January.

Matt Roseveare / Grey heron (Ardea cinerea) catching and feeding on lugworm (Arenicola marina), Lymington and Keyhaven Marshes Nature Reserve, UK, May.

Roger Powell / Bar-tailed fodwit (Limosa lapponica) in winter plumage bathed in winter sun and catching a Lugworm (Arenicola marina). Holy Island (Lindisfarne), Nothumberland, England, UK December.

Roger Powell / Bar-tailed godwit (Limosa lapponica) in winter plumage, feeding on a Lugworm (Arenicola marina). Holy Island (Lindisfarne), Nothumberland, England, UK December.