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 of April, small flycatcher identification can be summed up in one short phrase – ”It’s a phoebe” (see Eastern Phoebe map at the end of this post below).
Anything is possible, of course, and spring migration is getting earlier each year, but if you think you have found, for example, an Alder Flycatcher in Pennsylvania in April, you’ll need some photo or audio documentation to verify it.
Alder Flycatcher records in the month of April – very few!
American Dipper showing off its white eyelid. Photographed near Cody, WY, March 2013, by David Sibley.
It’s one of the first things people notice when they get a good look at a Dipper – the eyelid flashes white when it blinks! This is so different from any other bird that it begs for an explanation. Understandably, many people assume that the flashing white eyelid must have something to do with the dipper’s unusual underwater habits, related to helping them see underwater, which leads to the common misconception that the white flash is a nictitating membrane.
All birds have a nictitating membrane, a translucent whitish/bluish “third eyelid” that flicks across the surface of the eye from front to back to protect it while still allowing some vision (more info on Wikipedia).
But the dipper’s flash is bright white, and travels from top to bottom and back up (and if you can examine it very closely you’ll see that it’s covered with tiny white feathers). It is the eyelid.
Because the eyelid is white, we notice every time a dipper blinks. They don’t blink a lot more than other birds, it’s just that most other birds have dark grayish eyelids without feathers, and blink more quickly, so their blinking is barely noticeable.
The next question is… Why? Why do dippers have white eyelids and then make a big show of blinking slowly? Nobody knows.
One idea that’s been proposed is that it’s a useful way of communicating with other dippers in the very noisy streamside environment, but that’s just a general idea about visual communication and doesn’t get any closer to explaining what dippers are trying to say with their eyelids. Even the authoritative BNA account by Willson and Kingery offers no explanation.
Maybe the dippers we see – blinking as they pop in and out of the water – are just blinking, and the white eyelid has some other specialized function at another time in their life. It’s a basic question about a relatively common and easy-to-see bird, and it could be answered by just observing and getting to know some dippers. And that seems like it would be a pretty nice way to spend a few months.
Willson, Mary F. and Hugh E. Kingery. 2011. American Dipper (Cinclus mexicanus), The Birds of North America Online (A. Poole, Ed.). Ithaca: Cornell Lab of Ornithology; Retrieved from the Birds of North America Online: [subscription required] http://bna.birds.cornell.edu/bna/species/229
Two Red-tailed Hawks in a single tree. Modified photo by David Sibley.
By the end of February, even in cold and snowy Massachusetts, Red-tailed Hawks are courting and forming pairs in preparation for nesting. It’s common to see the male and female of a pair sitting close to each other in a tree, and this provides a very powerful clue to identification.
Hawks are generally solitary and territorial, and will not tolerate another hawk nearby. The only exception is mated pairs. You won’t see two Rough-legged Hawks, or a Red-tailed and a Red-shouldered Hawk, sharing a tree like this on the wintering grounds. Therefore, whenever you see two hawks sitting this close to each other, it’s safe to assume that they are the same species and that they are nesting nearby, which greatly reduces the number of candidate species.
Habitat also helps, and since Red-tailed Hawk is the only large open-country raptor nesting in Massachusetts it’s easy to identify these two birds as Red-tails based on nothing more than their size and their choice of perches.
Some of you had noticed that the Sibley eGuide was not in the Kindle store any more. Apparently the new Kindle Fire HD tablet required changes in the app, but those are now completed, the app has been resubmitted to the Kindle store for approval, and it should be available within days.
The answer is at the end of the video, and in the text below.
It has been a relatively mild winter in Massachusetts, but the blizzard of Feb 2013 put over two feet of snow on the ground, effectively eliminating most of the grassy and weedy habitat sparrows need. In such conditions the plowed edges of roads become an oasis of open ground and exposed seeds, and sparrows gravitate to those edges. Thus a Le Conte’s Sparrow, a very rare visitor to Massachusetts, was found in Concord on 12 Feb. I suspect it had been at this location, somewhere in the acres of weedy and marshy habitat, since at least December, and was only found because of the snow that forced it into the open.
Given its behavior, it’s no surprise that it wasn’t found sooner. Le Conte’s Sparrow is known for being secretive, just like Grasshopper Sparrow and other species in the genus Ammodramus. They rely on camouflage for protection and usually crouch when alarmed rather than flying. The behavior shown in this video – burrowing under matted grass – is something most sparrows simply never do.
The Sibley eGuide to Birds app for iPhone has been updated.
This update adds thumbnail images of every species in the scrolling list and in search results, the option to display common names in French, Spanish, or Latin instead of English, the latest AOU taxonomy including splits of Scripps’s and Guadalupe Murrelet, new audio for Bendire’s Thrasher and Cackling Goose, and some minor corrections.
Similar features for Android and other platforms coming soon.
While watching a small flock of juncos at my bird feeder on December 17, 2012, I noticed one particularly brownish female. Considering subspecies and watching it a little further I noticed that it seemed more active and alert, darting around quickly and holding its body more upright than the other juncos. Could this be a regional difference? Maybe some western Juncos have a previously unnoticed tendency to stand more upright? Unlikely, but worth watching more to figure out what was going on.
Pencil sketches of Dark-eyed Juncos showing female (upper) and male (lower). Differences in posture and shape are described in the text below. Original pencil sketch copyright David Sibley.
One of the biggest challenges of identifying a Cackling Goose is just finding one, especially in the east where the species is rare and occurs mostly as single birds (of the relatively large and pale Richardson’s subspecies) among big flocks of Canadas. The photos below show one Richardson’s Cackling Goose among Canadas. See if you can pick it out in each photo, then read below for tips on what to look for.
Canada and Cackling Geese, Acton, MA. 14 November 2012. Photo by David Sibley.