On my usual birding circuit on the morning of 26 May 2015, along the Assabet River in Concord, MA, I heard the distinctive song of a Mourning Warbler. This species is a rare but regular migrant through the area, so finding one is a highlight any day, and I set to work to try to …
Below are six ducks in a typical foraging posture, with their heads underwater. See if you can identify the species by their back ends. (All paintings by David Sibley)
The Eastern and Western subspecies of Willet are often mentioned as likely candidates for splitting into two species. They differ in size, proportions, details of plumage, migration pattern, and have no overlap in breeding range and very little in winter range. There is a lot of good information in print about how to identify them …
Test your “partial cues” recognition skills. Each photo shows only part of a common North American backyard bird. (All photos © David Sibley.)
Cackling Goose is a rare fall migrant through Massachusetts and I usually see a couple of them each fall among the hundreds of Canada Geese around Concord. I look forward to the challenge of sorting through the flocks and picking these birds out, and once a candidate is located the identification has usually been straightforward – …
I have been noticing variation in American Pipit for many years, and last month I had the opportunity to photograph a small flock. The photos here are of three randomly selected individuals in that flock, all taken within a few minutes on October 27, 2014 in Acton, MA. The differences in color are striking: compare …
I saw a Cooper’s Hawk catch a Rock Pigeon a few days ago. By itself that experience is noteworthy – a Rock Pigeon is a big bird for a Cooper’s Hawk to handle – but more remarkable was the way the attack unfolded.
The most significant change for North American birders in the 2013 AOU Checklist supplement is the split of Sage Sparrow into two species: Sagebrush Sparrow and Bell’s Sparrow. In this arrangement Bell’s Sparrow includes the distinctively dark coastal California subspecies belli, as well as the much less distinctive interior California subspecies canescens. Sagebrush Sparrow is …
Recently on Cape Cod, Massachusetts, Mary Keleher noticed an egret with two long head plumes, and took a couple of photos. This bird matches well with the ones I discussed in 2011 in a previous blog post Little Egrets have been showing up in the northeast regularly enough for the last couple of decades that …
Here are some eBird maps showing all records for the month of April for several species of small flycatchers in eastern North America. A glance at these maps will show which species are possible in your area in the next few weeks, and this greatly simplifies flycatcher identification. For most of the east, through most …