Last winter’s Common Moorhen in Newfoundland, given the likely split of New World and Old World moorhens into separate species, led me to try to determine the origin of the Newfoundland bird. That study of photos turned up a few small differences in bill color and shape, but nothing fully reliable. Now I have finally […]
The Newfoundland Moorhen was an American based on back color Read More »
In these two very similar species, the head plumes of adults provide the single most obvious and reliable distinction. The brief descriptions in field guides fail to convey the fundamental differences in these feathers, so a detailed description is given here to clarify those differences.
Differences in plumes of Little and Snowy Egret Read More »
This is a follow-up to my recent post about Optical illusions and bird identification. While working on some heron studies the other day, I found a good example of an illusory bill size comparison. Compare the bill in the two images of Reddish Egret shown below. To my eye, at least, the bird on the
More on illusions of size Read More »
I’ve been aware of some variation in songs of Blackpoll Warbler for many years, and now an interesting post by Andrew Spencer at Earbirding prompted me to check into it a little more closely. Many years ago Will Russell pointed out to me that the birds nesting in Alaska all sang a more rapid series
Does Blackpoll Warbler have song dialects? Read More »
In a footnote here I mentioned that blackish feathers can appear gray because of powder down, and now I will offer a little more explanation.
Powder down and the Black-crowned Night-Heron Read More »
On 18 May 1987, while birding at Cape May, NJ, I came across a small group of Cattle Egrets foraging in a field. Accompanying them was the bird in the photos below. In shape and behavior it was identical to all of the other Cattle Egrets, but its head and neck were mostly dark grayish.
Does Cattle Egret have a dark morph? Read More »
23 Jun 2011 – Concord, MA Sitting at my desk today I was roused by a bird call that I did not immediately recognize. This is a very rare occurrence for me, especially at my house where I spend many hours every day, and I know the birds that are here very well. As the
On 9 Jun 1987 I was leading a WINGS tour group at Churchill, Manitoba, and we chartered a small boat to go out on the river for an hour or so to see Belugas and look for birds. During this trip I spotted a distant loon on the water, which struck me as being large
An apparent hybrid Yellow-billed x Common Loon Read More »
Here is a classic optical illusion – the three horizontal lines in the image below are all the same length. Yes, they are identical (move your cursor over the image to see the proof). I’ve been pondering this illusion and wondering how often we see similar effects in bird identification. I suspect that a lot
Optical illusions and bird identification Read More »
See my detailed discussion of White-crowned subspecies here, which needs updating with the information below. In early May 2011 I spent several days in southeastern Arizona, and devoted a lot of time to studying the White-crowned Sparrows. At that date most of them were migrant Interior West birds of subspecies Z. l. oriantha. Most of
Distinguishing Interior West from Western Taiga White-crowned Sparrows Read More »