The head shape of Herring Gulls seems to change seasonally

sketch of gull head shapes

I always enjoy studying Herring Gulls, just looking at variation and trying to categorize the birds into age, sex, and regional groups. Last winter I was watching the gull flock at Turners Falls, MA, paying special attention to when the adults molted into breeding plumage. My thought was that the early-molting birds would be from …

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12 days until “What it’s like to be a Bird” goes on sale, with a starred review!

My newest book becomes available April 14th, in bookstores everywhere. You can read a little more about it at these links: here in my web store An excerpt is available at my publisher’s website and a starred review has been published in Library Journal I’ll be posting more in the coming days, stay tuned, and …

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Interviews

North Country Public Radio – October 10, 2003 David Sibley led a group of North Country birders along Clarkson University’s nature trails last fall. Martha Foley went along. The Diane Rehm Show – May 30, 2001 (scroll down) David Sibley: The Sibley Guide to Birds NPR Science Friday: December 22, 2000 Annual Audubon Christmas Bird …

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Which bird book should I buy?

The Sibley Guide to Birds Focus: bird identification Region covered: North America north of Mexico Species covered: 810 The Sibley Guide to Bird Life & Behavior Focus: understanding the behavior and ecology of birds Region covered: North America north of Mexico Species covered: over 800, information is summarized by bird family, with species mentioned as …

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Identification of the Martha’s Vineyard Red-footed Falcon

Illustration of the Red-footed Falcon perched. The smooth gray color is unlike any North American Falcon. Old juvenal wing and tail feathers are slightly brownish and barred, while adult feathers will be uniform blackish. Juvenal feathers are obvious on the outer tail, the primaries (molt reveals the boldly barred inner web of one outer primary), …

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Updates and Corrections for the Sibley Western Guide

p 143 – Pacific Golden-Plover: on adult male breeding the labels pointing to undertail coverts and flanks are reversed. p. 252 – White-throated Swift: name is incorrect, Whited-throated Swift p. 279 – Greater Pewee: map is a duplicate of Buff-breasted Flycatcher map. The summer range of this species should extend slightly farther north in Arizona, …

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