David Allen Sibley


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David Allen Sibley isn't a Goodreads Author (yet), but they do have a blog, so here are some recent posts imported from their feed.

The head shape of Herring Gulls seems to change seasonally

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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Published on February 13, 2020 10:44
Average rating: 4.54 · 6,926 ratings · 398 reviews · 53 distinct worksSimilar authors
The Sibley Guide to Birds

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4.67 avg rating — 2,177 ratings — published 2000 — 5 editions
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The Sibley Field Guide to B...

4.63 avg rating — 1,236 ratings — published 2003 — 5 editions
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The Sibley Guide to Bird Li...

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4.45 avg rating — 1,064 ratings — published 2001 — 3 editions
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The Sibley Field Guide to B...

4.69 avg rating — 822 ratings — published 2003 — 3 editions
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Sibley's Birding Basics

4.20 avg rating — 559 ratings — published 2002 — 6 editions
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The Sibley Guide to Trees

4.38 avg rating — 343 ratings — published 2009
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The North American Bird Guide

4.83 avg rating — 18 ratings — published 2000 — 3 editions
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The Sibley Birder's Life Li...

4.27 avg rating — 15 ratings
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Sibley Birds of Land, Sea, ...

4.92 avg rating — 12 ratings
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Sibley's Backyard Birds: Ea...

4.30 avg rating — 10 ratings — published 2010
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“It can be difficult to accept the fact that a lot of birds have to be identified as “possible” or “probable.”
David Allen Sibley, Sibley's Birding Basics

“Many species undergo an additional partial molt each year, involving just some head and body feathers. This most often occurs in the late winter or early spring and is called the pre-alternate molt, resulting in the alternate plumage. Many species, but not all, have an alternate plumage. Because this is only a partial molt (not involving all feathers), the new feathers of the alternate plumage are worn alongside the older feathers of the basic plumage.”
David Allen Sibley, Sibley's Birding Basics

“The H-P system indicates the age of the bird in essentially the same way as the Life-Year system. The bird is considered to be in its first year (with plumages labeled first basic and first alternate) from hatching until the prebasic molt a year later, in its second year from that time until the following prebasic molt, and so on.”
David Allen Sibley, Sibley's Birding Basics

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The History Book ...: BIRDING AND BIRD WATCHING 47 117 Feb 03, 2019 06:50PM  


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