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Waders flock together seeking new feeding grounds during the incoming tide at the Royal Society for the Protection of Birds' (RSPB) Snettisham nature reserve in Snettisham, England, Sept. 9, 2013.
The reserve lies on the edge of "The Wash," one of the most important bird estuaries in the UK, supporting over 300,000 birds.
A few times every year, higher than average tides force thousands of waders including Knot, Oystercatchers, Sanderlings, Black and Bar Tailed Godwit and Plover to take flight and advance up the mud flats in search of food.
The event is one of the most incredible wildlife spectacles in the UK.
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Pink-footed geese fly over the reserve at sunrise, Sept. 9, 2013, in Snettisham, England.
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Oystercatchers, Knot and other waders shuffle across the mud flats during the incoming tide at the Snettisham nature reserve, Sept. 9, 2013.
Dan Kitwood/Getty Images
Oystercatchers gather after seeking new feeding grounds during the incoming tide at the Snettisham nature reserve, Sept. 9, 2013.
Dan Kitwood/Getty Images
Godwit flock together seeking new feeding grounds during the incoming tide at the Snettisham nature reserve, Sept. 9, 2013.
Dan Kitwood/Getty Images
Pink-footed geese land on a lake during the incoming tide at the Snettisham nature reserve, Sept. 9, 2013.
Dan Kitwood/Getty Images
Waders flock together seeking new feeding grounds during the incoming tide at the Snettisham nature reserve, Sept. 9, 2013.
Dan Kitwood/Getty Images
A general view over the wash after high tide at the Snettisham nature reserve, Sept. 9, 2013.
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Another view of the wash after high tide at the Snettisham nature reserve, Sept. 9, 2013.
Dan Kitwood/Getty Images
Oystercatchers, Knot and other waders shuffle across the mud flats during the incoming tide at the Snettisham nature reserve, Sept. 9, 2013.
Dan Kitwood/Getty Images
Waders gather after seeking new feeding grounds during the incoming tide at the Snettisham nature reserve, Sept. 9, 2013.
Dan Kitwood/Getty Images
A general view over the wash after high tide at the Snettisham nature reserve, Sept. 9, 2013.
Dan Kitwood/Getty Images
Godwit flock together seeking new feeding grounds during the incoming tide at the Snettisham nature reserve, Sept. 9, 2013.
Dan Kitwood/Getty Images
Waders flock together seeking new feeding grounds during the incoming tide at the Snettisham nature reserve, Sept. 9, 2013.
Dan Kitwood/Getty Images
Oystercatchers, Knot and other waders cross the mud flats during the incoming tide at the Snettisham nature reserve, Sept. 9, 2013.
Dan Kitwood/Getty Images
Birdwatchers gather as Waders flock together seeking new feeding grounds during the incoming tide at the Snettisham nature reserve, Sept. 9, 2013.
Dan Kitwood/Getty Images
The sun rises over the Snettisham nature reserve ahead of the incoming tide, Sept. 9, 2013.
Dan Kitwood/Getty Images
Oystercatchers gather after seeking new feeding grounds during the incoming tide at the Snettisham nature reserve, Sept. 9, 2013.
Dan Kitwood/Getty Images
Birdwatchers gather as waders flock together seeking new feeding grounds during the incoming tide at the Snettisham nature reserve, Sept. 9, 2013.
Dan Kitwood/Getty Images
Pink-footed geese and waders flock together seeking new feeding grounds during the incoming tide at the Snettisham nature reserve, Sept. 9, 2013.
Dan Kitwood/Getty Images
Waders flock together seeking new feeding grounds during the incoming tide at the Snettisham nature reserve, Sept. 9, 2013.
Dan Kitwood/Getty Images
Waders flock together seeking new feeding grounds during the incoming tide at the Snettisham nature reserve, Sept. 9, 2013.
Dan Kitwood/Getty Images
Godwit and other waders gather after seeking new feeding grounds during the incoming tide at the Snettisham nature reserve, Sept. 9, 2013.
