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Date: Sun, 24 Aug 2003 21:16:19 -0700
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From: Bill Bousman <[[email protected]]>
Subject: Re: [SBB] molting phalaropes
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At 01:11 PM 8/24/03 -0700, Tom Grey wrote:
>I went to Shoreline around high tide (midday) yesterday, and was clicking
>away at shorebirds driven in to forage on the flats in Adobe Creek, when a
>small group of phalaropes showed up. They were all in molt, and seem all --
>at least all that I got reproducible pictures of -- to have been
>Red-necked. Here are five phalaropes in four pictures (though I think they
>are just four separate birds); I've been trying to figure out sex and age.
>
>  1. http://www.geocities.com/tgrey41/PhalMolting.jpg
>Adult female RNPH?
>
>2. http://www.geocities.com/tgrey41/PhalMolting2.jpg
>Juvenile RNPH?
>
>3. http://www.geocities.com/tgrey41/PhalWESA.jpg
>With juvenile Western Sandpiper (lots of them in attendance), adult RNPH,
>molt gone too far to determine sex from plumage pattern?
>
>4. http://www.geocities.com/tgrey41/Phals.jpg
>Left, adult RNPH, furthest molted of any of these -- male by size? Right,
>looks to be the same bird as (2), juvenile RNPH.
>
>In other news, the Cliff Swallows were posing nicely. Here is a juvenile
>making use of solar energy.
>http://www.geocities.com/tgrey41/CliffSwallowJuv.jpg
>
>Tom Grey

I lack the experience to tell the difference between an adult molting into 
basic and a juvenile well into first basic.  However, looking at these 
pictures, I don't see any birds with the fresh rufous edges on the 
scapulars and tertials that I would expect to see on a juvenile.  All of 
these birds seem well on their way to basic and I don't see anyway to sex 
them (I find size differences difficult to judge correctly, even from 
photos).  I would leave them all as molting Red-necked Phalaropes, 
achieving basic plumage.

Bill 

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