Ruddy Turnstone (Arenaria interpres) looking into crab shell, Rye, East Sussex, UK Ruddy Turnstone (Arenaria interpres) cleaning out a crab shell, Rye, East Sussex, UK. The Turnstone aptly named, it will flip stones of almost its own body weight has been recorded feeding on a very wide range of prey, including bird's eggs, chips and even corpses, in this case a crab shell.