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posted February 29th, 2012; last edited February 28th, 2012 –– David Sibley Trumpeter Swan with yellow patches on the bill, a well-known individual in Scarborough, Ontario. This photo taken in Jan 2012 by Jill Ramsay, used by permission. In a previous post I’ve talked about Trumpeter Swans with yellow bill spots as a source of confusion with Tundra Swan. I speculated that the yellow spots might [...] posted July 25th, 2011; last edited July 25th, 2011 –– David Sibley Trumpeter Swan showing definite yellow patch on the loral skin. Magee Marsh, Ohio, June 2011. Photo copyright Wil Domke, used by permission. The photo above was recently sent to me by reader Wil Domke. It shows an adult Trumpeter Swan (based on bill size and shape, and on Wil’s identification in the field) [...] posted February 19th, 2006; last edited April 8th, 2010 –– David Sibley The separation of Trumpeter and Tundra Swans has been a perennial challenge. Both are obviously swans, and given decent looks they are easy to distinguish from Mute Swan, but criteria for separating Tundra Swan from Trumpeter Swan are subjective and often vague, requiring experience and/or direct comparison. Until recently there were relatively few places where [...] |
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