Subject: [Tweeters] Meaning of double male and double female symbols?
Date: Sat Jul 25 20:15:51 PDT 2020
From: Whitney Neufeld-Kaiser - whitney.n.k at gmail.com

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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