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posted May 1st, 2012; last edited May 1st, 2012 –– David Sibley Molt is the process of feather replacement. All birds do it; they have to grow new feathers once or twice a year to stay warm, dry, and airborne, and in many cases they grow differently colored feathers at different seasons to match their surroundings or to impress others of their species. Among the small [...] posted February 1st, 2012; last edited February 1st, 2012 –– David Sibley Identify the species shown in each photo by clicking the multiple choice answers. I hope to make short quizzes like this a regular feature of this website, so please leave feedback on what you like or dislike about it. Thanks! posted August 4th, 2011; last edited September 5th, 2011 –– David Sibley An orange-throated male Ruby-throated Hummingbird seen in late August 2009 in Virginia. Photograph copyright Masaharu Ishii, used by permission. Update 16 August: a new post Progress on the orange-throated hummingbird mystery. Update 14 Aug 2011: A follow-up to this post is now available, tempering some of these points and adding more questions – Orange-throated [...] posted April 5th, 2011; last edited April 20th, 2011 –– David Sibley American Robin in run-on song bout that began with an imitation of Eastern Kingbird. Normal singing posture is more relaxed and upright. Pencil sketch copyright David Sibley. On 5 April 2011 in Concord Massachusetts I was walking the edge of a field where I often go birding, and heard very distinctly the sputtering call [...] posted March 30th, 2011; last edited April 4th, 2011 –– David Sibley Reader Richard Messer sent me the photos below, asking if I knew what the behavior was that displayed the white “rump spots” of the Carolina Wren. My answer is “no”. I’ve noticed spots like this a few times in the field, but never had a chance to really wonder about them. The BNA account for [...] |
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