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2017 AOS Supplement is Out!

Every summer, birders anxiously await publication of the “Check-list Supplement” by the American Ornithological Society’s Committee on Classification and Nomenclature of North and Middle American Birds (a.k.a. the NACC). The supplement details revisions to the NACC’s Check-list Below is a brief rundown of those changes. (You can read the Supplement here, and you can read the committee members’ comments on the proposal here.)

Be sure to check out ABA’s annual Check-list Redux” in Birder’s Guide to Listing & Taxonomy. There, you’ll find photos, maps, and more detailed analysis of these changes. (You can see last year’s “Check-list Redux” here.) 

You can read all the proposals on which the NACC voted this year at Species marked with asterisks (*) below are those which do not appear on the ABA Checklist, either because there are no currently accepted records in the ABA Area or because they are non-natives that have not yet been admitted to the list. Daggers (†) denote extinct species. Nowadays, it can be assumed that any change in taxonomy is due (at least partly) to analysis of new genetic data, so that is not always mentioned below. As a general policy, the NACC accepts as additions to its North American Check-list any species the ABA’s Checklist Committee adds to its list. Those changes are not listed here.

This year, the topics most likely to generate discussion are splits of Red Crossbill and Magnificent Hummingbird, a lump of Thayer’s and Iceland gulls, and a resolution of sorts into the taxonomic affiliations of the unique Yellow-breasted Chat.


Hello to the Cassia Crossbill


  • Red Crossbill (Loxia curvirostra)
  • Cassia Crossbill (Loxia sinesciuris)


In the Albion Mountains and South Hills of Cassia County, Idaho, there are no tree squirrels. Scientists have convincingly argued that this novel situation has allowed for the evolution of the area’s very own resident species of crossbill: Loxia sinesciuris, known as the Cassia Crossbill. Indeed, sinesciuris means “without squirrels”. In most of the Rockies, the seeds of lodgepole pine (Pinus contorta) are eaten, stored, and buried by tree squirrels such as the red squirrel (Tamiasciurus hudsonicus). In Cassia County, however, there are no squirrels, so the pines have been locked in an evolutionary arms race with but one main predator: the crossbill. Over thousands of years, the pine evolved bigger and harder cones to prevent the crossbill from accessing its seeds. And the crossbill evolved a bigger, deeper bill and stronger facial muscles in order to pull the seeds out of the cones.

This situation is remarkable because it happened in the presence of other crossbills. Two “types” of Red Crossbill (2 and 4), from which Cassia Crossbill was split, still commonly visit the area. But crossbill flocks are very cohesive and seem to form regional dialects quickly. The Cassia Crossbill not only has a different bill structure compared to the Red Crossbills with which it shares its range—but it also has different vocalizations. It seems that the evolution of Cassia Crossbill is a rare example of sympatric speciation in birds.

Good locations for seeking this species in the South Hills of south-central Idaho include Wahlstrom Hollow, Lower Penstemon Campground, Pettit Campground, the Diamondfield Jack parking area, and the Bostetter Guard Station. All are eBird hotspots. Separation of Cassia Crossbill from Red Crossbill is challenging, to say the least. Photos and audio recordings are certainly helpful, but note the following: Cassia Crossbill’s songs are more complex than those of Red Crossbill. Its dyup call has been described as dry, hollow, noticeably lower-pitched, and duller-sounding than the jip! of  “Type 2” Red Crossbill; it may even recall the chup of an agitated American Robin. Cassia Crossbill’s bill is shorter and thicker than those of the Red Crossbill “types” in the area.

Finally, the Idaho Press Club lists CASH-uh (such as in the middle two words of “to cash a check”) as the preferred pronunciation of the county and, thus, the bird.


Goodbye to Thayer’s Gull

Larus thayeri Larus glaucoides thayeri

Thayer’s Gull is now treated as a subspecies of Iceland Gull. The authors of the Supplement state that more research is needed to determine if kumlieni should still be maintained as a valid subspecies; many birders and scientists believe it is instead a hybrid swarm between L. g. glaucoides and L. g. thayeri. Whatever you believe, your ABA Area list just decreased by one if you’ve seen both.

Thayer’s Gull in Illinois. Photo by Michael Retter.

Unfortunately, this lump breaks the NACC’s own “A=B+C Rule”, which states that unique English names should be used for splits and lumps so as to avoid confusion. When someone shouts “Iceland Gull” at the lakewatch this winter, what does it mean? Does the speaker intend a purely white-winged bird (glaucoides sensu stricto), as I would? L. g. glaucoides or L. g. kumlieni? Or glaucoides, kumlieni, or thayeri? It seems that Baffin Gull, Arctic Gull, Inuit Gull, Green-billed Gull, and Silver-winged Gull could have been workable and confusion-saving alternatives for naming the more-inclusive taxon.

Split of Magnificent Hummingbird

  • Rivoli’s Hummingbird (Eugenes fulgens)
  • Talamanca Hummingbird* (Eugenes spectabilis)

This split separates birds of southern Central America from those of Mexico, the U.S., and northern Middle America. Rivoli’s Hummingbird is found in pineoak woodlands from the southwestern U.S. south to northern Nicaragua; adult males have a peridot-colored (yellow-green) throat and blackish underparts. Talamanca Hummingbird is found in cloudforest and high oak forests of Costa Rica and western Panama; adult males have a turquoise- or teal-colored throat and dark green underparts. The latter was originally named “Admirable Hummingbird” by Robert Ridgway, but his suggestion was unheeded. Instead, Eugenes spectabilis has been named for the Talamanca Mountains of eastern Costa Rica.

This split raises the not particularly serious question of what to call a Berylline x Magnificent hybrid, which birders had playfully dubbed “Beryificent Hummingbird”. Berivoli’s? Riviline?


Split of Northern Harrier

  • Northern Harrier (Circus hudsonius)
  • Hen Harrier* (Circus cyaneus)

This split separates New World and Old World populations. The main effect on ABA Area birders is that of a scientific name change for Northern Harrier.

Adult male Hen Harriers are noticeably different compared to their Northern cousins. They are clean gray above (no dark mottling), have a larger black wingtip that covers six rather than five primary tips, and a medium gray (not black) trailing edge to the secondaries from above. They also tend to be clean white below. Females are difficult to tell apart. Juvenile Hen Harriers are strongly barred below on a rusty backgroundnot clear and rusty below as in Northern.

There are no accepted ABA Area records of Hen Harrier, but a severed wing discovered on Attu Island in 1999 may be from this species.


Split of Northern Shrike

  • Northern Shrike (Lanius borealis)
  • Great Gray Shrike* (Lanius excubitor)

This split separates New World and Old World populations. It seems that the Northern Shrikes from North America and northeast Asia are more closely related to Loggerhead Shrikes than they are to Great Gray Shrikes from western and central Eurasia. The effect on most ABA Area birders is that of a scientific name change for Northern Shrike.

The Northern Shrike race sibiricus nests in northeastern Siberia. As an adult, it differs from borealis in having pale lores and no white borders over the black mask. It also tends to be slightly paler gray above and lack a white spot on the lower eyelid. Identification of young birds seems less straightforward; juvenile sibiricus may have a pale border over the mask, but wholly pale lores may warrant scrutiny.

There are no accepted records of Great Gray Shrike from the ABA Area. In vol. 46, no. 2 of Western Birds, Gibson and Withrow write that sibiricus is “casual in [the western] Aleutians…[with] two specimens [at the University of Alaska Museum and] published photos [by] Schwitters.” Migrant “gray shrikes” in western Alaska deserve extra scrutiny.

LeConte’s Is One Word

  • Le Conte’s Thrasher ➛ LeConte’s Thrasher
  • Le Conte’s Sparrow ➛ LeConte’s Sparrow

Historical evidence strongly suggests that 19th-century entomologist John Lawrence LeConte, after whom the sparrow and the thrasher are named, did not usually write his last name with a space in it.

Split of Anas and New Sequence for the Dabbling Ducks

The genus Anas was found to be paraphyletic, so it has now been split into four genera: Sibirionetta (Baikal Teal), Spatula (shovelers, including false teal), Mareca (Gadwall, Falcated Duck, and wigeons), and Anas (mallards, pintail, and true teal). Surely unsurprising to some birders familiar with the appearance of many hybrid dabbling ducks will be that among these species, Baikal Teal’s lineage is distinct and split off first from the others. Many male hybrid dabbling ducks (for instance, Mallard x Gadwall, Gadwall x Northern Shoveler, American Wigeon x Green-winged Teal, Blue-winged Teal x Green-winged Teal) display a facial pattern strikingly similar to that of Baikal Teal, and this is believed to be an ancestral trait that sometimes reappears with hybridization. The new sequence and scientific names are as follows.

• Baikal Teal (Anas formosa Sibirionetta formosa)

  • • Garganey (Anas querquedulaSpatula querquedula)
    • Blue-winged Teal (Anas discorsSpatula discors)
    • Cinnamon Teal (Anas cyanoptera Spatula cyanoptera)
    • Northern Shoveler (Anas clypeata Spatula clypeata)
    • Gadwall (Anas strepera Mareca strepera)
    • Falcated Duck (Anas falcata Mareca falcata)
    • Eurasian Wigeon (Anas penelope Mareca penelope)
    • American Wigeon (Anas americana Mareca americana)
    • Laysan Duck (Anas laysanensis)
    • Hawaiian Duck (Anas wyvilliana)
    • Eastern Spot-billed Duck (Anas zonorhyncha)
    • Mallard (Anas platyrhynchos)
    • American Black Duck (Anas rubripes)
    • Mottled Duck (Anas fulvigula)
    • White-cheeked Pintail (Anas bahamensis)
    • Northern Pintail (Anas acuta)
    • Green-winged Teal (Anas crecca)


Goodbye, Chen

The genus Anser was found to be paraphyletic, so the “white goose” genus, Chen, has been lumped into the “gray goose” genus, Anser. The sequence and scientific names for the Anser geese are now as follows.

• Emperor Goose (Chen canagicus Anser canagicus)
• Snow Goose (Chen caerulescens Anser caerulescens)
• Ross’s Goose (Chen rossii Anser rossii)
• Graylag Goose (Anser anser)
• Greater White-fronted Goose (Anser albifrons)
• Lesser White-fronted Goose (Anser erythropus)
• Taiga Bean-Goose (Anser fabalis)
• Tundra Bean-Goose (Anser serrirostris)
• Pink-footed Goose (Anser brachyrhynchus)


Sparrows, Spindalises, Yellow-breasted Chat, and a number of Tropical Groups Get Their Own Families and a New Sequence

Yellow-breasted Chat in South Dakota. Photo by Michael Retter.

Studies of higher-level taxonomy in the perching birds has revealed deep evolutionary divisions, warranting that these groups be put in their own families. Birders and ornithologists have long known that Yellow-breasted Chat is an odd bird, and now we have the proof. A warbler it is not.

Beware the similarity between the words Icteridae (the New World Blackbird family) and Icteriidae (the Yellow-breasted Chat family)—the latter has only an extra i to differentiate it! As for pronunciation, I imagine the blackbird family will be most commonly pronounced ICK-ter-ih-day, and the Yellow-breasted Chat family ick-TEHR-ee-ih-day.

  • Rhodinocichlidae (Thrush-tanagers)
  • Emberizidae (Old World Buntings)
  • Passerellidae (New World Sparrows and Towhees)
  • Calyptophilidae (Chat-tanagers)
  • Phaenicophilidae (Hispaniolan Tanagers)
    Neospingidae (Puerto Rican Tanager)
  • Spindalidae (Spindalises)
  • Zeledoniidae (Wrenthrushes)
  • Teretistridae (Cuban Warblers)
  • Icteriidae (Yellow-breasted Chat)
  • Icteridae (New World Blackbirds)
  • Parulidae (New World Warblers)
  • Mitrospingidae (Dusky-faced Tanager and three South American Species:

Olive-backed Tanager, Red-billed Pied Tanager, and Olive-green Tanager)

  • Cardinalidae (Cardinals and Allies)
  • Thraupidae (True Tanagers)


Goodbye, Procelsterna

  • Blue-gray Noddy (Procelsterna ceruleaAnous ceruleus)

The noddy genus Anous was found to be paraphyletic, so the genus Procelsterna has been absorbed into it. Blue-gray Noddy occurs in Hawaiian waters.


Goodbye, Mesophoyx

  • Intermediate Egret (Mesophoyx intermediaArdea intermedia)

The genus Ardea was found to be paraphyletic with respect to Mesophoyx.


New Genus for Yellow-fronted Canary

  • Yellow-fronted Canary in Kona, Hawaii. Photo by Michael Retter.

    Serinus mozambicusCrithagra mozambica

Established in Hawaii, Yellow-fronted Canary has been moved from the genus Serinus to Crithagra.


New Sequence for Sandpipers


Upland Sandpiper

Bristle-thighed Curlew


Little Curlew

Eskimo Curlew

Long-billed Curlew

Far Eastern Curlew

Slender-billed Curlew

Eurasian Curlew
Bar-tailed Godwit
Black-tailed Godwit
Hudsonian Godwit
Marbled Godwit
Ruddy Turnstone
Black Turnstone
Great Knot

Red Knot



Broad-billed Sandpiper

Sharp-tailed Sandpiper

Stilt Sandpiper
Curlew Sandpiper

Temminck’s Stint

Long-toed Stint

Spoon-billed Sandpiper

Red-necked Stint



Rock Sandpiper

Purple Sandpiper

Baird’s Sandpiper
Little Stint

Least Sandpiper
White-rumped Sandpiper

Buff-breasted Sandpiper

Pectoral Sandpiper
Semipalmated Sandpiper
Western Sandpiper

Short-billed Dowitcher

Long-billed Dowitcher

Jack Snipe
Eurasian Woodcock

American Woodcock

Solitary Snipe

Pin-tailed Snipe
Common Snipe

Wilson’s Snipe

Terek Sandpiper

Common Sandpiper

Spotted Sandpiper

Green Sandpiper

Solitary Sandpiper

Gray-tailed Tattler

Wandering Tattler

Lesser Yellowlegs


Spotted Redshank

Common Greenshank

Greater Yellowlegs

Common Redshank

Wood Sandpiper

Marsh Sandpiper

Wilson’s Phalarope

Red-necked Phalarope

Red Phalarope


New Sequence for Finch Genera







































Changes to Sequence and Subfamily Classification within the New World Blackbirds (Icteridae)

  • Xanthocephalinae (Yellow-headed Blackbird)
  • Dolichonychinae (Bobolink)


  • Sturnellinae (Meadowlarks)



  • Ambylcercinae* (Yellow-billed Cacique)


  • Cacicinae* (Oropendolas and true caciques)




  • Icterinae (New World Orioles)


  • Agelaiinae (New World Blackbirds)











Notable Changes That Were Not Accepted

  • Split of Willet into Eastern and Western willets
  • Two-way split of Bell’s Vireo
  • Two-way split of Brown Creeper
  • Three-way split of Yellow-rumped Warbler
  • Lumping of Yellow-eyed and Dark-eyed juncos
  • Lumping of Common and Hoary redpolls
  • Changing English name of Ring-necked Duck to Ring-billed Duck


On the Horizon

Topics which may be considered next year include splitting Naumann’s Thrush from Dusky Thrush, splitting White-winged Scoter, splitting Cuban from Eastern Meadowlark, lumping Gilded Flicker back into Northern Flicker, and lumping Bicknell’s Thrush back into Gray-cheeked Thrush. Major revisions of higher-level hummingbird and vireo taxonomy are also anticipated.




(Asterisks are no longer used to label species not found in the ABA Area; instead, they denote species that are not found in the the NACC Area.)


Split of Emerald Toucanet

  • Northern Emerald-Toucanet (Aulacorhynchus prasinus)
  • Southern Emerald-Toucanet* (Aulacorhynchus albivitta)

Northern Emerald-Toucanet is found from Mexico south to the Darién Gap; it includes three rather different-looking subspecies groups: prasinus, wagleri (“Wagler’s Toucanet”), and caeruleogularis (“Blue-throated Toucanet”). Southern Emerald-Toucanet is found in South America.


Split of Prevost’s Ground-Sparrow

     • White-faced Ground-Sparrow (Melozone biarcuata)
      • Cabanis’s Ground-Sparrow (Melozone cabanisi)

White-faced Ground-Sparrow is resident from Chiapas south to western Honduras; it has an extensively white face. Cabanis’s Ground-Sparrow is endemic to central Costa Rica; it has a complex pattern of reduced white on the face.

Split of Yellow-eyed Junco

  • Yellow-eyed Junco (Junco phaeonotis)
  • Baird’s Junco (Junco bairdi)

Baird’s Junco. Photo by Michael Retter.

Baird’s Junco, endemic to the highlands of southern Baja California Sur, has been split from the other populations of Yellow-eyed Junco. Baird’s averages browner on the flanks and duller on the back. It also tends to have a more complex song.



Genus Change for Violet-bellied Hummingbird

  • Damophila julie Juliamyia julie

The genus Damophila was coined in 1832 to describe a species of “micro” moth. It was not until 1854 that the same word was used to describe a hummingbird. According to the Principle of Priority, Damophila is not available for the hummingbird genus, which must be renamed. That “new” hummingbird genus is Juliamyia.  



New Genus for Red-breasted Blackbird

  • Sturnella militaris ➛  Leistes militaris


The red-breasted meadowlarks of South America and southern Central America now have their own genus. Note that Red-breasted Blackbird is called Red-breasted Meadowlark by the IOC.



New Genus for Cuban Blackbird


  • Dives atroviolaceusPtiloxena atroviolacea


Addition of Mangrove Rail to the Check-list

The large rails along the Pacific Coast of Central America (north to El Salvador) are considered to belong to Mangrove Rail (Rallus longirostris), which was until recently lumped into Clapper Rail.


Greenland Records

Nine species were added to the Check-list because of records in Greenland. They are:

  • Ruddy Shelduck (Tadorna ferruginea)
  • Western Water Rail (Rallus aquaticus)
  • Oriental Plover (Charadrius veredus)
  • Rook (Corvus frugilegus)
  • Hooded Crow (Corvus cornix)
  • Eurasian Blackcap (Sylvia atricapilla)
  • White’s Thrush (Zoothera aurea)
  • Meadow Pipit (Anthus pratensis)
  • Lesser Redpoll (Acanthis cabaret)


Additional Proposals Not Accepted

  • Split of Grayson’s Robin from Rufous-backed Robin
  • Split of Wagler’s and Blue-throated Toucanets from Northern Emerald-Toucanet
  • Split of Yellow-eyed Junco into Guatemalan and Mexican juncos
  • Wagler’s and Blue-throated toucanets split from Emerald Toucanetboth now contained within Northern Emerald-Toucanet
  • Split of Guatemalan Flicker from Northern Flicker




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Michael Retter
Michael L. P. Retter is the editor of the ABA's newest magazine, Birder's Guide. He also wears his ABA cap while working as a Technical Reviewer for Birding magazine. When not at home, Michael is often leading tours in Middle America (Mexico through Panama). He currently lives with his fiancé, Matt, in Fort Worth, Texas. In his fleeting free time there, he pursues interests in horticulture (especially orchids), music, cooking, and numismatics. Michael also runs GBNA, the continent's informal club and email list for LGBT birders.
  • Morgan Churchill

    Best part of these results: I can now talk about seeing a flock of spatulas on my last birding trip 😛

  • jmorlan

    Nice summary! I believe Western Water-Rail is hyphenated in the supplement, much to the dismay of some.

    • Morgan Churchill

      Is this about American Imperialism in birding 😛

    • Ted Floyd

      Ha! Was just now reading a treatise on redcedar vs. white-cedar. Go figure.

    • It is in one place but not the other.

    • Michael Retter

      Joe, it’s hyphenated in one place but not in the other!

      • jmorlan

        Only in discussion of the split discussing old name “Water Rail.” Western Water-Rail is hyphenated throughout and at

  • Ted Floyd

    I’m thinking “ick-turr-EYE-uh-dee” for the chat family?

    Then again, I’m in the process of reviewing an article on Yup’ik bird names, so I might not have my Latin head on straight at the moment.

    • Ted Floyd

      Er, “Latin” head. None of this stuff is really Latin.

  • Ted Floyd

    I don’t chase, but I would chase this bird:


    Greenland Records
    Nine species were added to the Check-list because of records in Greenland. They are:
    Eurasian Blackcap (Sylvia atricapilla)

    • Olaf Danielson

      yea, ultra cool bird

      • Ted Floyd

        It is Rick Wright, I believe, who has called it “The Better Nightingale.”

  • Tony Leukering

    Regarding Icteriidae and Icteridae, I think that the general English “rules” of pronunciation would have the emphasis on the third and second syllables, respectively. That is because the general rule (though we all know that English ignores most of the rules a large minority of times) is that the emphasis is on the third syllable from the end for three-, four-, and five-syllable words (ex.: pasteurize, Anthony, dithering, splendiferous, monopoly, preposterous, consanguinity, perpendicular, popularity). Yes, emphasis is often modified for words that have standard endings or beginnings that alter a verb to a noun (I forget, or never knew, the term for such), as in pasteurization, or the reverse, as in serializing. Though “Icteriidae” and “Icteridae” are latinized, they’re not actually Latin words, so following Latin “rules” of emphasis is not relevant. Besides, Latin is probably the source of the relative lack of hard-and-fast pronunciation rules so typical of English (unlike in the saner language that is Spanish).

    • I don’t believe there are rules of English pronunciation. 😉

  • Oscar Johnson

    Just a quick correction. The shrike taxa from western Asia (sibiricus, funereus, and mollis) are all included with Lanius borealis, not with Great Gray Shrike (L. exubitor) of the western Palearctic. The boundary between the two newly recognized species is in central Russia near the Ob River.

    • Olaf Danielson

      So maybe more of a chance to see one in either Newfoundland versus Gambell (but only 7 records through 2006 in Iceland) or reverses up and over the pole which could end up anywhere. Going to be a tough bird to ID, I fear

      • Oscar Johnson

        Yeah, it’s going to be tough for sure. I just looked at the handbook to the birds of the world, which splits excubitor and borealis and it had this to say about their identification: borealis is similar to excubitor, but rump and uppertail-coverts paler, supercilium more prominent, white in wing always restricted to primaries, greyer underparts extensively vermiculated dark, juvenile much darker and browner all over and more strongly barred below than juvenile excubitor.
        It seems like the main things to look for in a potential excubitor are white at the base of the secondaries, clean white underparts, and limited supercilium. Juveniles might be easier to separate than adults.

  • anon

    “This means that Emperor Goose is now the first species on the ABA Checklist. ”

    Shouldn’t the Whistling-Ducks still be the ‘first birds on the ABA checklist’, not the Emperor Goose? Emperor is the first goose tho, perhaps the intended meaning?

    • jmorlan

      Yes, Whistling-Ducks are still first.

      • Michael Retter

        Yes, thank you for catching that!

  • Cody Porter

    Just a quick note to say that types 2 and 5 (not 4) are the call types that annually co-occur with the Cassia Crossbill in the South Hills. In 3 summers there I have only found one type 4 (in the Albions).

    • Michael Retter

      Thank you, Cody!

  • Ed LeGrand

    Nice summary!!! The preferred pronunciation of “ae” in scientific names is a long “e” sound (see or “cae” For taxonomists in the future: when a species gets named for me, note that there is no space in “LeGrand”.

  • Ravenzrule

    So Carpodacus is back with us? (No Haemorhous is listed under “Sequence for Finch Genera”) Is this an error, or did I miss this change? The latter is quite possible, as there is a lot to digest in this supplement.

    • jmorlan

      Haemorhous is still there. It is well separated from Carpodacus right after Leucosticte..

      • Ravenzrule

        Ah, thanks so much for the guidance! I do see it now.

  • anon

    Question – maybe too minute to matter but stumbled across while reading the proposals:
    Within the blackbird reordering, and within the subfamily Agelaiinae, the proposal appears to list Tricolored Blackbird before the Red-winged and Red-shouldered Blackbird pair. This seems to follow the rule of listing the branch w/ fewer members prior to the one with more members. The proposal is accepted, but on the checklist Red-winged/Red-shouldered maintains its location before Tricolored.

    Is there a reasoning for this that I’m overlooking, or am I overlooking something? Or does the full checklist differ from the accepted proposal?

    Deep in the weeds….

    • jmorlan

      Where is the supplement are you seeing this? I don’t see anything there that specifies the sequence within Agelaius. Yes, the accepted proposal changes the sequence, but the supplement seems to be silent unless I’m missing something.

      • anon

        I was looking at the Phylogeny diagram on page 31 of the 2017-B set of proposals.
        It seems every other part of that proposed phylogeny that I recognize is reflected in the checklist except that one bit — the supplement doesn’t go into species level discussions on the point [that I can see], but it seems to be included in the proposal that was voted on and approved.

        • jmorlan

          Yes, so where is it that you are seeing the old sequence on the new checklist?

          • anon

            The spot on the checklist that has Red-winged Blackbird [and Red-shouldered] listed prior to Tricolored – on the phylogeny Tricolored comes first, then the pair.

          • jmorlan

            I wasn’t aware the AOS had already published the full revised checklist including the 58th supplement changes but found it here:


            Yes, the sequence of Agelaiinae in that checklist does not follow the approved proposal, instead retaining the old sequence.

            Maybe a clerical error?

          • anon

            Thanks —

            So — the question becomes – do we update our state lists based on the checklist or on what the checklist seems like it _should_ be? I see you’ve got CA in sync with the AOU checklist — I think that makes sense to stay in accordance w/ the checklist even if there might be a clerical error in it —

            But I’ll maybe we’ll get lucky and they’ll come up with an edit before long?

          • jmorlan

            I sent a query on this to one of the checklist authors asking for clarification.

  • Mick Lewis

    I see myself as a layman birder (with 40 years experience). I am amazed at the knowledge level of some I have rubbed shoulders with or seen comments on birding sites.
    My comment regards “listing” yes I know that is a bad word to some.
    If a species gets split can I instantly add 1 to my life list or do I need to see it again before it can be added. For example Northern Harrier, I have seen many in Canada but cannot say I looked close enough to differentiate it from the Hen Harrier which I had seen many times when living in the UK. How many birders will be looking closely at Northern Harriers in the hope of spotting the first Hen Harrier vagrant in North America?

    • Morgan Churchill

      Generally people do count things after they are split, as long as they feel confident they can assign the birder to the proper species. I wouldn’t hesitate to count Northern Harrier on my list, given that I have seen hundreds at this point and I am pretty sure I can state with certainty they were not Hen Harriers.

  • patgo

    Change all the scientific names you want. Leave the common names alone. It’s still magnificent, so it’s Magnificent Hummingbird to me. And who is Rivoli?

    • jmorlan

      François Victor Masséna, Duke of Rivoli. Amateur ornithologist and husband of “Anna.”

  • Pingback: 2017 Birder’s Guide to Listing & Taxonomy « ABA Publications()

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