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Shiny Cowbird age

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Old Thursday 15th August 2019, 14:06   #1
delia todd
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Shiny Cowbird age

Can someone confirm whether or not this is an immature male Shiny Cowbird.

https://www.birdforum.net/gallery/sh...p?photo=628409

If it is, I'd like to upload it to The Opus article.

Many thanks guys.
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Old Friday 16th August 2019, 10:49   #2
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Ummmm.... no ideas at all? Anything would help
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2006 63, 2007 52, 2008 46, 2009 32, 2010 31, 2011 27 Total 81 Last Patch tick: Magpie (locally scarce)

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Is not to die - Thomas Campbell (17771844)


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Old Friday 16th August 2019, 12:55   #3
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From Neotropical birds online
Quote:
Juvenile (First Basic plumage): In most subspecies (other than northern minimus), shows sexual dimorphism in First Basic plumage; this is the only species of cowbird that is dimorphic at this stage (Jaramillo and Burke 1999).

Male. Varying from dark chaetura drab to fuscous black on upperparts; wing coverts margined with dusky grayish brown, creating 2 wing-bars; underparts dull buffy-gray, heavily streaked with sooty grayish-brown to fuscous black. Abdomen washed with yellowish buff. As in Brown-headed Cowbird (Molothrus ater), underwing coverts of Juvenile male may average darker than those of Juvenile female (Pyle 1997).

Female. Varying from light tawny olive to buffy brown; wing coverts margined with grayish tawny, creating 2 wing-bars; underparts varying from dull light buffy to light grayish, slightly washed with buffy and distinctly, but not always conspicuously, streaked with light grayish brown.
I therefore do not believe it can be juvenile. Older immature maybe? https://neotropical.birds.cornell.ed...cow/appearance
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Old Friday 16th August 2019, 15:02   #4
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Thanks so much for that Niels
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2006 63, 2007 52, 2008 46, 2009 32, 2010 31, 2011 27 Total 81 Last Patch tick: Magpie (locally scarce)

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Is not to die - Thomas Campbell (17771844)


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Old Friday 16th August 2019, 15:41   #5
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There is nothing that points to this being immature or adult Cowbird males have adult like plumage after their first pre-basic molt in the fall, and can't be distinguished form adult males without close examination of wear and mot limits..
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Old Friday 16th August 2019, 16:08   #6
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Thanks so much Andy.

Much appreciated.
__________________
In between goals is a thing called life, that has to be lived and enjoyed

My Lockdown List report - 2019 Down Under Trip Report

2006 63, 2007 52, 2008 46, 2009 32, 2010 31, 2011 27 Total 81 Last Patch tick: Magpie (locally scarce)

To live in hearts we leave behind
Is not to die - Thomas Campbell (17771844)


The only true wisdom is knowing you know nothing - Socrates
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