Excellent question, Bernice (in Chicago).
Got wood-warbler questions? If so, I have answers for you. I'm Daniel Edelstein — biologist, birding guide, birding instructor (www.warblerwatch.com and danieledelstein@att.net) — who ponders: Are there any wonders in our world more fascinating than the elegant beauty of wood-warblers? (All photos © Martin Meyers unless otherwise noted.) By the way, my upcoming new adult college birding class is featured at: http://danielsmerrittclasses.blogspot.com/
Monday, March 28, 2022
Warbler Guy, what are some techniques I can use to increase my ability to remember warbler songs and commit them to my long-term memory? Birding by ear tips you recommend?
Wednesday, March 2, 2022
Warbler Guy, what are some techniques I can use to increase my ability to remember warbler songs and commit them to my long-term memory? Birding by ear tips you recommend?
Excellent question, Bernice (in Chicago).
Wednesday, January 26, 2022
Warbler Guy, what’s an example of a “superspecies” in the wood-warbler family?
What’s an example of a “superspecies” in the wood-warbler family?

(The Black-Throated Gray Warbler in the above photo is one of five species within the Black-Throated Green superspecies group.)
Thanks for the query, Ms. Jones (in Santa Barbara, CA).
Think of a superspecies as a group of related species that evolved from a common ancestor, but live in distinct ranges apart from each other. A good example of a superspecies is the Black-Throated Green Warbler group that includes this species as well as Townsend’s, Hermit, Golden-Cheeked, and Black-Throated Gray Warblers.
Each of the latter four species in the above group is thought to have evolved from its Black-Throated Green ancestor. As this species expanded from its southeastern USA deciduous forest territory into coniferous forest created by the most recent glacial advances, isolation occurred among populations. As generations of separated populations slowly spread west and north throughout lower North America, each population became a divergent “island.” Gene flow ceased as reproductive isolation caused speciation to occur over eons. The resulting five species share various field marks, but also express their own unique characteristics.
Nonetheless, despite their status as species, hybridization sometimes occurs among species within a superspecies, including the Black-Throated Green superspecies wherein populations of Townsend’s and Hermit hybridize in Oregon and Washington. To simplify, where both species occur, over time Townsend’s appear to usually dominate and increase in number.
More technical, the five species within the Black-Throated Green superspecies have parapatric distributions. That is to say, each of the five species has ranges that do not significantly overlap but are immediately adjacent to each other (and/or occur together in a narrow contact zone, with the aforementioned reference to Townsend’s and Hermit Warbler hybridization a scenario where overlapping occurs).
To learn more about this subject, read a classic article by R.M. Mengel titled “The probable history of species formation in some northern wood warblers.” One source where this article appears is in a 1964 edition of “Living Bird” (page 943).
Saturday, January 1, 2022
Warbler Guy, I typically seek rare bird species when I go afield, but it's SO cold now I am doing Project Feederwatch (from my breakfast room). What's its format/method?
https://feederwatch.org/about/detailed-instructions/#choose-count-days
Feel free to note:
The FeederWatch season always begins the second Saturday in November and runs through the end of April. The 2021–22 FeederWatch season begins on November 13. The last day to start a two-day count at the end of each season is April 29.
We here in Novato (Marin Co., CA....20 miles north of the Golden Gate bridge) have sunflower chips, thistle, and suet that coaxes birds into our view for counting.....Usually, no rare species visit, but we have an occasional Pine Siskin that is NOT rare, but is uncommon except for local abundance (especially among Alder tree groves).....and a Townsend's Warbler has been visiting our suet (NOT a typical behavior....for this non-breeding season visitor).
Meanwhile, enjoy and please feel free to visit my web site to learn about my birding tours that I have hosted for 25+ years: WarblerWatch.com
Regards, Daniel Edelstein
Novato, CA
Friday, December 17, 2021
Warbler Guy, do you think the Myrtle and Audubon's Yellow-rumped Warbler subspecies will be designated new species (i.e., the YRWA species will be split?)?
Mari (in Phoenix), it's an interesting question that continues to be debated as researchers and American Ornithological Society (AOS) committee members continue to debate whether the Yellow-rumped Warbler species should potentially be split into two new species (Audubon's and Myrtle)....or, perhaps, even three or four (based on how two other subspecies — Black-fronted and Goldman's — within this species occur outside the USA's 48 lower states.
Currently, the defining organization for this question — the AOS — does not have a new proposal to entertain a split that would result in species status for Myrtle and Audubon's. In fact, in recent years, an AOS committee turned down a proposal to create species status for more than Myrtle and Audubon's, but also, perhaps, Black-fronted and Goldman's subspecies within the Yellow-rumped complex.For more current information, the following link is worth reading:
https://www.allaboutbirds.org/goodbye-yellow-rump-will-we-see-a-return-to-myrtle-and-audubons-warblers/
I'll provide more updates on this question as I learn of new information.
Regards to all, Daniel
Birding Guide (since the 1980s)
Saturday, November 27, 2021
Warbler Guy, which warblers are most likely to be seen on Christmas Bird Count surveys in the Midwest? Likely Christmas Bird Count warblers in the East? Likely Christmas Bird Count warblers in New England?
Stacey (in Boston), you may be asking this question because some Yellow-rumped Warbler(s) were seen on recent Christmas Bird Count(s) (CBC)?If so, you are spot-on in thinking this species is the most likely Parulidae (wood-warbler) Family member to show up during the non-breeding season in northern latitudes.Here's one posting of a Rare Bird Alert from New Hampshire where people witnessed threeYellow-rumped Warbler (YRWA):3 YELLOW-RUMPED WARBLERS were seen at Odiorne Point
State Park in Rye on December 29, 2014.
For the full account of the "rare" bird species detected during this 1/1/14 CBC survey, please see:http://birdingonthe.net/hotmail/EAST.001114302.htmlWhich other warbler species are the most likely to appear in the dead of winter in NH or other upper Midwest and East Coast areas?Beyond the YRWA, look for the following as the "usual suspects":(and NOT typically annual every "winter" in northern USA latitudes):- Common Yellowthroat- Palm- Yellow-breasted Chat (more typically Mid-Atlantic and south from there)- Pine (sometimes eats seeds at winter feeders)Long shots, and rarely present (and NOT typically annual every "winter"):- Bay-breasted- Black-and-white- American Redstart- Cape MayFeel free to write me with more questions, Stacey....and other readers:danieledelstein@att.netWarblerWatch.com
(hosts "Birding Links" for free birding info. & also hosts my resume)WarblerWatch.blogspot.com
(my warbler-centric blog since 2007)
Monday, October 25, 2021
Warbler Guy, are there any New World warblers that occur in their own family and where shall I look?

Hello Jeremy (in Toledo, OH):
Breeding from southern Arizona through New Mexico and south into Mexico and Nicaragua, the Olive Warbler is the only member of the genus Peucedramus and the family Peucedramidae. All our other New World warblers in the continental USA are in the Parulidae family (except for rare to occasional vagrant sightings of Old World Warbler sightings — among them being Arctic and Dusky Warbler).
The Olive Warbler status in its one-member family is distinctive in that it's the only bird family endemic to North America (including Central America). Before it was classified into its current family, this warbler was considered a Parulidae, but DNA studies suggest that it split early in its evolutionary history from the other related passerines prior to the differentiation of the entire New World warbler/American sparrow/Icterid group.
Where should you look for this species?
Like many other New World warblers, it is an insectivorous species of coniferous forests.
According to the iBird Pro app I used to interpret its distribution range, Olive Warbler is restricted to breeding in central/east-central Arizona and a small portion of southwestern New Mexico. It's non-breeding season range includes southern Arizona most of western Mexico and a restricted area of northeastern Mexico immediately south of Texas.
Though it is often said to be non-migratory, most New Mexican birds typically leave the state from November to late February.