Tidal and subtidal mussel beds in the Dutch Wadden Sea. 1) Aerial view of intertidal mussel beds. 2) Intertidal mussel bed during high tide, with Common eider, Common shore crab, Spiral wrack and Mullets. 3) Low tide. Subtidal mussel bed, with starfish, sea anemone, crab, hydroid polyps. 3a) Close-up with phytoplankton, mollusc larvae, diatoms. Intertidal mussel bed with Eurasian oystercatcher, European herring gull, Common eider. 3b) Close-up with Japanese oyster, Blue mussel, byssus threads, pseudofaeces.