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.

Variation in eastern Fox Sparrows

Mid-March is when the first northbound Fox Sparrows show up in Massachusetts, and it’s always a pleasure to see this burly, richly-colored sparrow. I’ve been working on some new illustrations showing the variation among the birds in my yard this week. Regional variation in Fox Sparrow is extensive, and gets a lot of attention, with …

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Published on March 18, 2021 12:23
Average rating: 4.53 · 8,487 ratings · 625 reviews · 62 distinct worksSimilar authors
The Sibley Guide to Birds

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4.68 avg rating — 2,307 ratings — published 2000 — 5 editions
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The Sibley Field Guide to B...

4.64 avg rating — 1,348 ratings — published 2003 — 5 editions
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The Sibley Guide to Bird Li...

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4.46 avg rating — 1,102 ratings — published 2001 — 3 editions
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The Sibley Field Guide to B...

4.69 avg rating — 891 ratings — published 2003 — 3 editions
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What It's Like to Be a Bird...

4.38 avg rating — 916 ratings3 editions
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Sibley's Birding Basics

4.22 avg rating — 691 ratings — published 2002 — 6 editions
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The Sibley Guide to Trees

4.39 avg rating — 370 ratings — published 2009
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The Sibley Birder's Life Li...

4.38 avg rating — 21 ratings
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The North American Bird Guide

4.84 avg rating — 19 ratings — published 2000 — 3 editions
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Sibley Birds of Land, Sea, ...

4.92 avg rating — 13 ratings
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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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