The question of age variation has come up repeatedly in redpoll discussions, so I finally tried to find an answer to the question of just how important age-related variation in plumage might be. And based on published studies the answer is … not very important. Seutin et al. (1992) studied redpolls at Churchill, Manitoba using […]
Redpoll age variation and ID Read More »
[edited 12 Feb 2008]From Texas comes the remarkable news of the discovery of an apparent White-crested Elaenia (Elaenia albiceps) found by Dan and Honey Jones on 9 Feb 2008. Photos, sound recordings, and ID discussion can be found at Martin Reid’s website and some great photos at Erik Breden’s website. The bird was found at
White-crested Elaenia – new for North America Read More »
Feb 24 – I’ll be speaking at the Northwest Branch of the Corpus Christi Public Library on February 24th at 4 PM to help celebrate the opening of their new Clif Moss Nature Education Center. Some details here. And if you’re in the area that weekend check out the Celebration of Whooping Cranes in nearby
Upcoming events in early 2008 Read More »
Redpoll identification is challenging because Hoary and Common Redpoll seem to show an unbroken continuum of variation from pale to dark, and there are no fully reliable differences. So birders have to rely on a subjective assessment of overall color and struggle to define the threshold for confident identification. Virtually all birders see redpolls only
Urging caution when identifying Common Redpolls Read More »
I’m reposting here some comments I just sent to ID-Frontiers, about a pale redpoll in Illinois and another in Massachusetts: The comment under these photos on the ILBIRDS forum giving the bird an index score between 11 and 12 is, I would say, overly generous. The undertail coverts that we can see (not much) seem
Comments on two redpolls Read More »
Just a quick update on my window-collisions research: I’ve heard from several more people who have tried the highlighter with pretty good success. Continuing my own experiments here I’ve had over a month of 100% success with an array of monofilament stretched between two wooden boards outside the window. The monofilament is suspended a couple
More Bird-friendly Window Treatments Read More »
[edited 12 and 14 Jan, 2008, adding comments about the index] I’ve been thinking about redpolls more, and had another, more careful, look at Troy’s 1985 paper, which is filled with interesting observations and some serious “food for thought”. First of all, Troy identified redpoll specimens using a character index, which is a well-established method
A Character Index for Redpoll identification Read More »
I have had two inquiries about Tropical Parula in the last 24 hours, prompted by a bird currently in Austin, Texas. You can check out that bird in photos by Andy Balinsky and photos and some background by Martin Reid. It has the throat pattern and extensively yellow underparts of Tropical Parula, but the pale
On the MOU website: a Hoary photo Here from Minnesota (where Hoary is expected and the threshold is low) of a pale Hoary-type with a relatively long bill Some other recent Hoary photos from Michigan – scroll left and right to see about 5 shots From Ontario this photo and the two following show a
A couple of Redpoll additions Read More »
More thoughts on redpolls after yesterday’s post, prompted by my own nagging doubts and a query from Nick Anich: In all of this redpoll ID discussion, I think people ask the general question “How can I identify a Hoary?” when what they mean is the more specific question “Just how pale/small-billed/unstreaked does a redpoll have
The Redpoll Questions Read More »