Sub-adult Ring-billed Gulls, Lake Michigan region – 201402

A selection of 1st-cycle / 2nd-calendar year and 2nd-cycle / 3rd-calendar year Ring-billed Gulls Larus delawarensis, seen in the southern Lake Michigan region, USA, in February 2014.

1st-cycle / 2nd-calendar year individuals

13 February 2014, BP Whiting refinery, Indiana, USA. From left to right: adult, 2nd-calendar year, 3rd-calendar year Ring-billed Gull.

13 February 2014, BP Whiting refinery, Indiana, USA. From left to right: adult, 2nd-calendar year, 3rd-calendar year Ring-billed Gull.

13 February 2014, BP Whiting refinery, Indiana, USA. 2nd-calendar year Ring-billed Gull. Note the number of replaced coverts.

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

13 February 2014, BP Whiting refinery, Indiana, USA. 2nd-calendar year Ring-billed Gull.

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

13 February 2014, BP Whiting refinery, Indiana, USA. 2nd-calendar year Ring-billed Gull.

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

13 February 2014, BP Whiting refinery, Indiana, USA. 2nd-calendar year Ring-billed Gull.

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

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

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

2nd-cycle / 3rd-calendar year individuals

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.

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

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

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

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

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

13 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.

References

Ring-billed Gulls vs Common Gulls: comparison from a Dutch perspective- 201402

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