Recent discussion of the identification of a white goose in Ohio (beginning here) prompted me to put together some sketches of bill shapes of Ross’s and Snow Geese, since bill shape is the most significant difference between those species. It was a very interesting exercise, as each species is surprisingly consistent in the relative size […]
Identification of white geese Read More »
New from Scott & Nix – Sibley’s Raptors of North America poster List price $29.95 24 x 36″ Buy from Amazon Buy from Scott & Nix, framed or unframed Other recent products Audubon’s Birds of America (Facsimile) – the first modern reproduction of this iconic work. The Natural History Museum of London made new high-resolution
New Raptors poster and other gift ideas Read More »
The Sibley eGude to Birds for iPhone and iPad has been updated to be a universal app. The new version takes advantage of the full screen of the iPad to show images and maps at high resolution, show all information (images, text, map, and audio) on a single screen, and in landscape orientation allows viewing
eGuide update – Redesigned for iPad! Read More »
A recent article by Tim Enthoven in the New York Times – Don’t Blink! The Hazards of Confidence – offers some fascinating thoughts on judgment, expertise, and illusions of confidence, and it’s an interesting perspective from which to examine the challenge of bird identification. One of his key points is that confidence does not arise
In a recent post at the ABA blog, a new smartphone app is described that promises to help identify bird songs in the field. Bird song identification software has been around for a long time, mostly running on desktop computers and used for research, and the idea of having that capability in a smart phone
Does technology make birders lazy? Read More »
I recently commented on this ID problem on MassBird, pointing out differences in details around the eyes. Chipping sparrow has very distinct, narrow whitish arcs below and ABOVE the eye, contrasting with darker gray-brown feathers, and broken at front and BACK by the dark eyeline. Simply looking for these distinct white arcs is a good
On identifying Chipping and Clay-colored Sparrows Read More »
After all the discussion of orange-throated and red-throated hummingbirds, I thought it would be helpful to add a brief and simplified summary of how the brilliant iridescent colors of hummingbirds are produced. These are structural colors, not pigment, which means they are reflected by microscopic structural features of the feather surface. The diagram here shows
The basics of iridescence in hummingbirds Read More »
Thanks to Sheri Williamson (author of the Peterson Field Guide to Hummingbirds) and her recent post titled Orange-throated hummingbirds – not so mysterious after all, we have a solid contribution towards understanding the orange throats of some Ruby-throated Hummingbirds, although I contend that mysteries still remain. She explains the details of iridescent color on hummingbirds, and a
Progress on the orange-throated hummingbird mystery Read More »
Patterns of translucence in wing feathers provide useful identification clues for many species of birds – terns, gulls, hawks, and others. Generally the translucent parts of the wing are those where there are fewer layers of feathers to block the light, and less pigment in the feathers. I’ve written about this before in my book
The finer points of wing translucence Read More »
Now updated by a new post Progress on the Orange-throated hummingbird mystery. This adds to my previous post about orange-throated hummingbirds. After hearing from a couple of hummingbird banders affirming that they do not see a change in throat color in the fall as male Ruby-throated Hummingbirds go though their summer molt (and the fact
Orange-throated Hummingbirds: more questions Read More »