I think Hal has it right, shorthand for plural .. "first year females" or "first year males" ...


Lyn TopinkaVancouver, Wa.
NorthwestJourney.comColumbiaRiverImages.comNorthwestBirding.com
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-------- Original message --------From: HAL MICHAEL <ucd880 at comcast.net> Date: 7/25/20 9:16 PM (GMT-08:00) To: Whitney Neufeld-Kaiser <whitney.n.k at gmail.com>, Tweeters <tweeters at u.washington.edu> Subject: Re: [Tweeters] Meaning of double male and double female symbols?


Plural? 







Hal Michael

Olympia WA
360-459-4005
360-791-7702 (C)
ucd880 at comcast.net




On 07/25/2020 8:15 PM Whitney Neufeld-Kaiser <whitney.n.k at gmail.com> wrote:










Hi, Tweets.  I recently noticed that David Sibley uses double male and double female symbols in his guide book, and I don't know what those mean.  I looked high and low for a legend, to no avail.  Can anyone help?





If you have a Sibley guidebook or app sitting next to you, a double male symbol shows up in the House Finch entry in the note that "some 1st year [double male symbol] identical" to adult female.  And the double male and double female symbols both appear in his Pine Grosbeak entry with the note that "some [double female symbol] and 1st year [double male symbol] have russet plumage."






An example of the double male symbol is also here:  
https://en.wikipedia.org/wiki/Pileated_woodpecker#/media/File:111_Pileated_Woodpecker,_b.jpg






Thanks!


Whitney Neufeld-Kaiser


Seattle, WA

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