As scientists research birds, we be taught extra about how varied sorts are associated. Generally, two that had appeared completely different grow to be such shut family members that they’re “lumped” into one species. Extra typically, slight variations grow to be vital, and a hen is “break up” into two or extra species. At any time when these adjustments are printed, severe birders are desperate to see how their birding life lists will change.
For years, updates had been printed usually by a committee of the American Ornithological Society (AOS)—the identical committee that maintained the official record of North American hen species. Lately, a parallel record treating all birds of the world has been maintained by eBird, the app and database hosted by the Cornell Lab of Ornithology. Each the AOS and eBird printed new updates in late October 2026, giving North American birders some new names to be taught and a few new species to determine.
Though the 2 lists stay largely the identical, they do differ in a couple of key methods. Previously yr, the Nationwide Audubon Society—and, subsequently, Audubon journal—has shifted to align with eBird’s international record on account of Audubon’s increasing work throughout the Americas. So these are the names you’ll now discover within the hen information and all communications and tales transferring ahead. Right here’s what else you have to know in regards to the adjustments this yr and the place every record landed.
Why the Willet was break up into two species
The Willet, a giant, noisy sandpiper with a flashy wing sample, is widespread in North America. Birders had lengthy observed variations between two populations, which are actually formally acknowledged as distinct species on each the AOS and eBird lists.
The western birds, now known as Prairie Willets (Tringa inornata), nest round inland marshes from the Dakotas and the Canadian prairie provinces to jap California. They migrate to coastal areas for the winter—abundantly alongside the Pacific Coast, but additionally all alongside the Gulf Coast and southern Atlantic Coast, north to New Jersey and typically farther. Throughout migration they could be seen all through the inside of the West and scattered by the jap states, particularly across the Nice Lakes.
Saltmarsh Willets (Tringa semipalmata) nest in salt marshes (appropriately sufficient), all alongside the Gulf and Atlantic coasts, from Texas to jap Canada. They spend the winter in coastal areas of Central and South America, with some making lengthy overwater flights to get there. They’re nearly by no means discovered inland; even in jap North America, nearly all Willet data contain the Prairie species.
These two species typically might be separated by vary and season, however they overlap alongside the Gulf and Atlantic coasts throughout migration seasons. The Prairie Willet averages bigger in measurement. Each species are plain pale gray-brown in winter plumage, barred with black in breeding plumage, however the Prairie Willet averages paler in any respect seasons. Invoice form is likely one of the greatest discipline marks: That of the Saltmarsh Willet is heavier, with a thicker tip, whereas that of the Prairie Willet is thinner and extra tapered, giving the impression of being longer.
A story of two Marsh Wrens—lastly
Chattering and sputtering as they lurk among the many cattails, Marsh Wrens are widespread from coast to coast. Greater than 40 years in the past, researchers observed an intriguing sample: Males within the West sang extra completely different songs than their jap cousins. Ongoing research regularly revealed different variations, together with genetic ones. It seems they’re solely separate species, now formally acknowledged by the AOS and eBird.
It seems they’re solely separate species, now formally acknowledged by the AOS and eBird.
The Western Marsh Wren (Cistothorus paludicola) and Japanese Marsh Wren (Cistothorus palustris) might be recognized by vary in most areas, however they meet on the Nice Plains and within the Canadian prairie provinces, and telling them aside there’s a delicate problem. Visually they’re very comparable. Their songs differ barely. That of the Western is harsher and extra variable, with many rattling sounds, and begins with a number of exhausting chuck notes. That of the Japanese typically begins with a buzzy notice, occurring right into a barely musical effervescent sequence. Birders hoping to determine these wrens in the midst of the continent ought to attempt to research recordings first, akin to the various on-line examples within the Macaulay Library on the Cornell Lab of Ornithology.
Catching up on warblers and whimbrels
Two species splits introduced by eBird in 2025 are actually formally acknowledged by the AOS as effectively. The Whimbrel, that large curve-billed shorebird, is now separated into the Hudsonian Whimbrel (Numenius hudsonicus) within the Americas and the Eurasian Whimbrel (Numenius phaeopus) within the Previous World. The Eurasian species, greatest acknowledged by its white or pale rump, is an everyday vagrant to North America with dozens of data, particularly in Alaska.
The Yellow Warbler, in the meantime, has lengthy been thought of one of the vital widespread breeding members of its family, nesting in every single place from the Arctic to South America. Now its vary has been lower in half, with the Northern Yellow Warbler (Setophaga aestiva) widespread in North America throughout the breeding season, and the Mangrove Yellow Warbler (Setophaga petechia) resident alongside coastlines from Mexico and the Caribbean to South America and the Galapagos Islands. In the US, Mangrove Yellow Warblers might be discovered within the Florida Keys and close by within the Everglades, in addition to on the southern tip of the Texas coast. These in Florida look similar to the Northern Yellow Warbler however with a darker cap, tinged reddish within the males. In Texas, male Mangrove Yellow Warblers are simply acknowledged by their chestnut-red heads.
Extra notable hen identify updates for 2026
Along with these large splits, a couple of different birds acquire new names this yr, for a wide range of causes, on each the AOS and eBird lists.
The Painted Redstart (regionally widespread within the Southwest) turns into Painted Whitestart, and Slate-throated Redstart (a uncommon customer there) turns into Slate-throated Whitestart. Birders have been suggesting this alteration for years. The identify “redstart” initially utilized to a number of small songbirds of Eurasia with reddish tails; the “begin” got here from Previous English “steort,” that means tail or rump. In our American Redstart, a warbler unrelated to those Eurasian birds, the male additionally has reddish within the tail. However the warbler we’ve got lengthy known as Painted Redstart has flashy white outer tail feathers as a substitute, so “whitestart” appears affordable.
The “begin” got here from Previous English “steort,” that means tail or rump.
The Tufted Flycatcher turns into Tawny Tufted-Flycatcher. This perky-crested sprite, a uncommon customer to the southwestern states, features a brand new modifier due to a break up from one other species discovered farther south.
The Purple-legged Thrush, a really uncommon customer to Florida, is now Western Purple-legged Thrush due to a break up from one other kind discovered farther east within the Caribbean.
The identify Fea’s Petrel was previously utilized to a posh of seabirds nesting on islands within the jap Atlantic and displaying up as uncommon guests off our southeastern coast, particularly off North Carolina. That advanced has now been break up into three species and the identify “Fea’s” has been retired. The birds showing in our waters are thought of more likely to be Desertas Petrels, though Zino’s and Cape Verde Petrels are additionally attainable, and identification will probably be an ongoing problem owing to the intense similarity of all three types.
And birders who observe scientific names will notice that Winter Wren adjustments from Troglodytes hiemalis to Nannus hiemalis, and Pacific Wren adjustments from Troglodytes pacificus to Nannus pacificus.
The place AOS and eBird diverged on identify adjustments
This yr’s AOS replace included a couple of departures from eBird’s remedy, and these disagreements will trigger some confusion for birders. On species splits, the AOS lists Western Marsh-Wren and Japanese Marsh-Wren; eBird drops the hyphen and lists Western Marsh Wren and Japanese Marsh Wren. What eBird known as Northern Yellow Warbler and Mangrove Yellow Warbler, the AOS calls Yellow Warbler and Mangrove Warbler.
The largest distinction entails Nice Egret, lengthy thought of a worldwide species. The AOS has simply break up it into two, with Nice White Egret widespread in Eurasia, Africa, and Australia, and American Egret within the Americas. Nice White Egrets have been discovered a couple of occasions in western Alaska, however they’re extraordinarily uncommon elsewhere in North America. They differ from American Egrets in normally having the invoice all-black within the breeding season, not yellow, and in having variable quantities of yellow or pink on the legs.
For the second, both identify for the North American inhabitants is perhaps thought of right—American Egret or Nice Egret—however solely the Nice Egret has a banding code that has come to be a beloved shorthand identify for the species amongst birders: GREG.
