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David Sibley

White flickers

  This beautiful and striking bird is a partial albino Northern Flicker, photographed in Massachusetts in Sep 2015 by Michael Beagan. A second, very similar, bird had been photographed nearby in 2012 by John Harrison, and – besides being very attractive birds – the two provide a good opportunity to discuss some of the details

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Underwing pattern in Cory’s Shearwater

If you keep up on the news of subspecies, you will have heard of Scopoli’s Shearwater. It’s the Mediterranean breeding population of Cory’s Shearwater, overlapping very little with populations nesting on Atlantic Islands, and many authorities have split the two into separate species recently. Both populations occur off the Atlantic coast of North America, although Cory’s in

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Juvenile chickadees

The artwork shown here is available for sale, click here to view current auctions After being nearly invisible for weeks, the local chickadees here in Massachusetts are suddenly everywhere. This is their typical pattern, and it’s common to many species. Nesting pairs become very quiet and secretive while they have eggs and young in the

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The mysterious sounds of the American Woodcock

Download a free one-page guide to American Woodcock display The flight display of the male American Woodcock has to be one of the most remarkable avian performances in the world. And yet, despite the fact that countless ornithologists and birders have marveled at this spring spectacle, some very basic questions are still unanswered, including this

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