The double sex symbols show up in a few other accounts in the Sibley as well. I'm pretty sure the doubling just refers to plural/multiple birds rather than just one.
In an unrelated note--thanks everyone who sent tripod advice! The first page of my inbox was instantly filled with responses that were very helpful, and some responses continue to trickle in, but I think I have enough to work with now. Shawn Conrad http://users.2z.net/itasca_chippewa_birding/ > Date: Tue, 24 Feb 2009 22:05:54 -0600 > From: [email protected] > Subject: [mou-net] Sibley illustration Question: Odd Genetics? > To: [email protected] > > Hello Bird Nerds > > On page 525 of the Sibley Guide to Birds (Pine Grosbeak account) and > page 513 (Red-winged Black Bird account) there are illustrations of > plumage variations in those species that are denoted by two female > symbols or two male symbols. Why is this? Do such double symbols > indicate an unusual genetic sorting? Could this occur in all > passerines? Is this a printing error? I have seen photos of the Black > Bird variation and observed what Sibley calls "Russet" female Pine > Grosbeak variation in Northern Minnesota. I am quite curious as to > what this symbolism means. > > Alex Watson > > ---- > Join or Leave mou-net:http://lists.umn.edu/cgi-bin/wa?SUBED1=mou-net > Archives:http://lists.umn.edu/archives/mou-net.html _________________________________________________________________ Windows Live™ Hotmail®…more than just e-mail. http://windowslive.com/howitworks?ocid=TXT_TAGLM_WL_t2_hm_justgotbetter_howitworks_022009 ---- Join or Leave mou-net:http://lists.umn.edu/cgi-bin/wa?SUBED1=mou-net Archives:http://lists.umn.edu/archives/mou-net.html
