Comments on: Left-handed Crossbills? http://www.birdingak.com/2009/02/18/left-handed-crossbills/ ...a site for birders Fri, 03 Sep 2010 06:56:58 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: Aaron Lang http://www.birdingak.com/2009/02/18/left-handed-crossbills/comment-page-1/#comment-9 Aaron Lang Sun, 08 Mar 2009 03:17:52 +0000 http://www.birdingak.com/?p=366#comment-9 I'm pleased to be able to answer my own question. I recently discovered this very interesting paper: Benkman, C. W. 1996. Are the ratios of bill crossing morphs in crossbills the result of frequency-dependent selection? Evolutionary Ecology 10:119-126. It turns out that both left and right-mandibled crossbills exist, and this paper hypothesizes that this serves a very important purpose. The paper can be read and downloaded as a PDF here: http://www.uwyo.edu/benkman/ Click on the "Publications" link on the upper left of the page to find this and many other papers on crossbills. Aaron Lang I’m pleased to be able to answer my own question. I recently discovered this very interesting paper:

Benkman, C. W. 1996. Are the ratios of bill crossing morphs in crossbills the result of frequency-dependent selection? Evolutionary Ecology 10:119-126.

It turns out that both left and right-mandibled crossbills exist, and this paper hypothesizes that this serves a very important purpose.

The paper can be read and downloaded as a PDF here: http://www.uwyo.edu/benkman/ Click on the “Publications” link on the upper left of the page to find this and many other papers on crossbills.

Aaron Lang

]]> By: Robin http://www.birdingak.com/2009/02/18/left-handed-crossbills/comment-page-1/#comment-3 Robin Thu, 19 Feb 2009 03:41:44 +0000 http://www.birdingak.com/?p=366#comment-3 Wow, great photo of a male White-winged Crossbill! I know I will definitely be bookmarking this site for future reference. Wow, great photo of a male White-winged Crossbill! I know I will definitely be bookmarking this site for future reference.

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