Yellow-crowned Night Heron Nyctanassa violacea (formerly Nycticorax violacea )

A North American species that could conceivably reach mainland Europe. The first for the Western Palaearctic arrived on the Azores in 2010 but so far it hasn't occured any closer.

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adult Yellow-crowned Night-Heron, Ding Darling, Sanibel Island (Florida, USA), 16th April 2013