Just released and available for download at the Blackberry App World – The Sibley eGuide can now be used on any Blackberry Playbook tablet. All of the features of the eGuide on other platforms are included here: compare any two images, maps, or sounds on a single screen filter by state and by common species […]
The Sibley eGuide is now available for Blackberry Playbook Read More »
A pale and grayish female bluebird found in North Carolina recently (March 2012) provided a very interesting identification challenge. The plumage colors were a good match for a typical female Mountain Bluebird, and that is how it was first identified. North Carolina has only one previous report of Mountain Bluebird, so this bird received a
Identification of female bluebirds by wing structure Read More »
Most birds have a very different pattern on the upperside and underside of their wings. On the coverts (the leading edge of the wing) this is easily explained because we are looking at entirely different feathers above and below. On the primaries and secondaries, however, there is just a single layer of feathers. How can
Wings, above and below Read More »
Just released and available for download at the Windows Phone Marketplace – The Sibley eGuide can now be used on any device running Windows Phone 7. All of the features of the eGuide on other platforms are included here: compare any two images, maps, or sounds on a single screen filter by state and by
Sibley eGuide for Windows Phone 7 – now available Read More »
The feathers along the side of the lower jaw have a very confusing history of terminology. They’ve been called the malar stripe (in many early and mid 20th century bird books), the submoustachial ((Because this was a British proposal, the spelling is British “moustache” rather than the American “mustache”, and American bird guides have continued
What is the submoustachial? Read More »
The feathers that grow on the sides of the head above the eyes of a bird are called the supercilium, and when they contrast in color with the adjacent feathers we call that an eyebrow stripe. There’s lots of variation in the shape of the eyebrow stripe, and in some closely-related species this can be
The changeable shape of the supercilium Read More »