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Gracias Malcolm por la identificación y la explicación
The hood is actually dark brown. They lose it in winter but this one is just beginning to get it back. The very similar Mediterranean Gull, which also breeds in Valencia has a pure black hood but can be easily separated as it has pure white wing tips.
Lat: 39.48, Long: -0.31
Spotted on Jan 23, 2016 Submitted on Jan 24, 2016