black headed gulls flight over lake from danube delta tulcea county romania |
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| navigate by keyword : autumn backlight beak biodiversity biosphere bird birds black blackheaded blue composition county danube delta detail europe fauna flight four gull gulls headed heritage lake ligheanca mila more red reserve romania sea sunset tourism travel tulcea unesco water wings world |
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| The Danube Delta Biosphere Reserve, UNESCO World Heritage Site, Romania, has the third largest biodiversity in the world over 5,500 flora and fauna species |
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