Hi, Hal. Indeed, plural is the response I've received from 5 or 6 folks -
thanks to all! This is just not a usage I've ever seen before.

Cheers,
Whitney

On Sat, Jul 25, 2020 at 9:16 PM HAL MICHAEL <ucd880 at comcast.net> wrote:


> 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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>

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