http://www.wqed.org/birdblog/2008/12/31/visual-cues-for-crossbills/ A Bird Blog with Kate St. John Sun, 19 May 2013 21:27:55 +0000 hourly 1 http://www.wqed.org/birdblog/2008/12/31/visual-cues-for-crossbills/comment-page-1/#comment-5890 Kate St. John Thu, 01 Jan 2009 14:25:35 +0000 http://www.wqed.org/birdblog/?p=2090#comment-5890 Great comment! Mark also emailed me a link that explains that hemlock “opened cones may persist on the trees for slightly more than 1 year.” See http://www.na.fs.fed.us/spfo/pubs/silvics_manual/Volume_1/tsuga/canadensis.htm

]]> http://www.wqed.org/birdblog/2008/12/31/visual-cues-for-crossbills/comment-page-1/#comment-5885 Mark Thu, 01 Jan 2009 00:56:20 +0000 http://www.wqed.org/birdblog/?p=2090#comment-5885 I don’t know how easily old cones are “shed”. but I wonder if the gray cones are old ones from the previous season.

]]>