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On 12/31/2019 at 2:05 PM, Tony Leukering said:

Immature Herring -- there should be no juveniles of either Ring-billed or Herring in December, much less in April.

Hi, Tony!  For clarification:  Do you mean only adults would be seen in my area ("non-breeding" range per Cornell site) in Winter & Spring? Do Juveniles not migrate or do they mature in time for migration?

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1 hour ago, floraphile said:

Hi, Tony!  For clarification:  Do you mean only adults would be seen in my area ("non-breeding" range per Cornell site) in Winter & Spring? Do Juveniles not migrate or do they mature in time for migration?

No. A juvenile bird is one that is in juvenile plumage. I mean that there are no gulls in juvenile plumage in the northern hemisphere in that time period, which means that there are no juvenile gulls in that time period.

https://cobirds.org/CFO/ColoradoBirds/InTheScope/87.pdf

https://cobirds.org/CFO/ColoradoBirds/InTheScope/24.pdf

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For what it's worth - The way I interpret what Tony stated is that there is a difference between juveniles and immature. At that time of the year there would be no juveniles only immature. 

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32 minutes ago, Tony Leukering said:

No. A juvenile bird is one that is in juvenile plumage. I mean that there are no gulls in juvenile plumage in the northern hemisphere in that time period, which means that there are no juvenile gulls in that time period.

https://cobirds.org/CFO/ColoradoBirds/InTheScope/87.pdf

https://cobirds.org/CFO/ColoradoBirds/InTheScope/24.pdf

Thank you for sharing your excellent articles.  🙂 

 

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