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The image captures the intricate coiled castings created by a lugworm (Arenicola marina) on a sandy beach in Madagascar. These marine worms burrow in the sand, ingesting it to extract nutrients and leaving behind these characteristic coils. This natural pattern is a common sight on sandy shores where lugworms are active, reflecting their essential role in the coastal ecosystem. The smooth, wet sand and the precise formations highlight the quiet, yet vital, activities of these marine organisms in their natural habitat.