John Chan / Breeding colony of Elegant terns (Sterna elegans) gathered on a sandbar, Bolsa Chica Ecological Reserve, California, USA, March.
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John Chan / Breeding colony of Elegant terns (Sterna elegans) gathered on a sandbar, Bolsa Chica Ecological Reserve, California, USA, March.
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John Chan / Elegant terns (Sterna elegans) taking flight from sandbar at their breeding ground, Bolsa Chica Ecological Reserve, California, USA, March.
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John Chan / Breeding colony of Elegant terns (Sterna elegans) gathered on a sandbar, Bolsa Chica Ecological Reserve, California, USA, March.
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John Chan / Breeding colony of Elegant terns (Sterna elegans) gathered on a sandbar, Bolsa Chica Ecological Reserve, California, USA, March.
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John Chan / Breeding colony of Elegant terns (Sterna elegans) gathered on a sandbar, Bolsa Chica Ecological Reserve, California, USA, March.
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John Chan / Red-breasted merganser (Mergus serrator) preening on a sandbar, with Western sandpipers (Calidris mauri) feeding in the foreground, Bolsa Chica Ecological Reserve, California, USA, April.
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Guy Edwardes / Shetland coastline with tombolo connecting to St Ninian's Isle, Shetland Isles, Scotland, UK. August 2014.
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Guy Edwardes / Tombolo connecting St Ninian's Isle to Shetland, Shetland Isles, Scotland, UK. August 2014.
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David Fleetham / Although rarely seen, the Sandbar Shark (Carcharhinus plumbeus) is likely the most numerous of all shark species found in Hawaii.
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Alex Mustard / RF - Southern stingray (Dasyatis americana) swimming over sand ripples. Circular fisheye shot. Sandbar in Stingray City, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea. (This image m...
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Alex Mustard / Ripples in the sand of a shallow sandbar in clear water. Stingray City Sandbar, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.