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Aythya valisineria
This bird was found on January 9th 2003 at Infiltragebied, Castricum, and then seen until March 5th.
The bird was refound on October 14th 2005 and seen until Febuary 13th 2006. It was seen every winter and last seen on November 15th 2009.
The long-staying and returning bird seemed to wear a wingtag. Does this make it an escape or is another explanation possible, I don't know, but the Dutch seem to call it a Cat. E bird.
It was filmed by Steven Wytema on January 14th 2006.
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