4cy Thayer’s Gull – 20140216

This 3rd-cycle, 4th-calendar year Thayer’s Gull Larus thayeri was seen on 16 February 2014 at the BP Whiting refinery, Indiana, USA, together with Amar Ayyash and Matthew Winks.

One of the reasons why it attracted our attention was that it seemed to have a particular dislike for Merganaers: we saw it charge at least two individuals for (what appeared to us) no apparent reason. A quick dive by the Red-breasted Merganser Mergus serrator was all it took though to avoid bodily harm.

(Note that in the following photos the primaries and tail markings appear darker than we experienced them in the field.)

16 February 2014, BP Whiting refinery, Indiana, USA.

16 February 2014, BP Whiting refinery, Indiana, USA.

16 February 2014, BP Whiting refinery, Indiana, USA.

16 February 2014, BP Whiting refinery, Indiana, USA.

16 February 2014, BP Whiting refinery, Indiana, USA.

16 February 2014, BP Whiting refinery, Indiana, USA.

16 February 2014, BP Whiting refinery, Indiana, USA.

16 February 2014, BP Whiting refinery, Indiana, USA.

16 February 2014, BP Whiting refinery, Indiana, USA.

16 February 2014, BP Whiting refinery, Indiana, USA.

16 February 2014, BP Whiting refinery, Indiana, USA. Charging at a female Red-breasted Merganser.

16 February 2014, BP Whiting refinery, Indiana, USA. Charging at a female Red-breasted Merganser.

16 February 2014, BP Whiting refinery, Indiana, USA. Charging at a female Red-breasted Merganser (underwater) while a male Red-breasted Merganser looks on.

16 February 2014, BP Whiting refinery, Indiana, USA. Charging at a female Red-breasted Merganser (underwater) while a male Red-breasted Merganser looks on.

16 February 2014, BP Whiting refinery, Indiana, USA. Charging at a female Red-breasted Merganser while a male Red-breasted Merganser looks on.

16 February 2014, BP Whiting refinery, Indiana, USA. Charging at a female Red-breasted Merganser while a male Red-breasted Merganser looks on.

16 February 2014, BP Whiting refinery, Indiana, USA. Charging at a female Red-breasted Merganser.

16 February 2014, BP Whiting refinery, Indiana, USA. Charging at a female Red-breasted Merganser.

16 February 2014, BP Whiting refinery, Indiana, USA. Charging at a female Red-breasted Merganser.

16 February 2014, BP Whiting refinery, Indiana, USA. Charging at a female Red-breasted Merganser.

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