Migration notes, October.
Seven goose species occur regularly in North America: Canada, Cackling, Snow, Ross’s, Greater White-fronted, Brant, and Emperor. Telling them apart at distance is mostly about size, bill colour, and head pattern. The Canada/Cackling split is the trickiest. The rest are recognisable in flight once you know what to look for.
The seven species
The big black-necks:
- Canada Goose (Branta canadensis) - the iconic one. Brown body, black neck, white cheek patch. 30-43 inches long. Breeds across the northern half of the continent, winters as far south as Mexico.
- Cackling Goose (Branta hutchinsii) - looks like a small Canada Goose. 25-29 inches. Shorter neck, stubbier bill, higher-pitched call. Often in mixed flocks with Canada Geese.
The white snow-pair:
- Snow Goose (Anser caerulescens) - white with black wingtips (the “blue” morph is the same species, dark-bodied). Pink bill with black “grin patch”. Breeds Arctic, winters US Gulf coast and California.
- Ross’s Goose (Anser rossii) - looks like a tiny Snow Goose. Stubbier bill, no grin patch, more delicate face. Often mixed with Snow Geese in winter flocks.
The plain brown:
- Greater White-fronted Goose (Anser albifrons) - brown all over with a white patch at the base of the bill and irregular black belly bars. Breeds Arctic Alaska and Canada, winters California, Gulf, and Mexico.
The coastal black:
- Brant (Branta bernicla) - small, dark all over with a partial white “necklace”. Strictly coastal in winter - eats eelgrass. Atlantic and Pacific populations.
The northern specialty:
- Emperor Goose (Anser canagicus) - stocky, blue-grey body with white head and tail, black throat. Restricted to coastal Alaska and the Aleutians.
The Canada/Cackling split (the hard one)
The Cackling Goose was only formally split from the Canada Goose in 2004, and they look identical at distance. Useful field marks:
- Size: a Canada Goose is mallard-sized to small-Labrador-sized. A Cackling Goose is closer to a large duck.
- Bill length: Cackling has a stubbier, shorter bill in proportion to its head. Canada has a longer “Roman nose” profile.
- Neck length: Cackling has a short neck; Canada’s is longer.
- Voice: Cackling has a higher, faster, more yelping call. Canada is the deeper familiar honk.
In a mixed flock of “Canada Geese” in autumn, look for the noticeably smaller, shorter-necked birds with higher voices: those are Cackling.
Migration patterns at a glance
- Atlantic Flyway: Canada, Snow, Brant (eastern), some Greater White-fronted.
- Mississippi Flyway: Canada, Snow, Ross’s, Greater White-fronted, Cackling.
- Central Flyway: same mix, with more Ross’s and Greater White-fronted.
- Pacific Flyway: Canada, Cackling, Snow, Ross’s, Greater White-fronted, Brant (Pacific), Emperor (rare in lower 48).
The huge mid-continent autumn build-ups of Snow and Ross’s Geese at refuges like Squaw Creek (Missouri) or Bosque del Apache (New Mexico) are among the best wildlife spectacles on the continent.
Where to find them
- Bosque del Apache NWR (New Mexico) - winter Snow Geese, Sandhill Cranes, mixed flocks.
- Sacramento NWR Complex (California) - winter Snow, Ross’s, Cackling, Greater White-fronted.
- Cape May / Forsythe NWR (New Jersey) - Atlantic Brant winter staging.
- Izembek NWR (Alaska) - the only place to see Emperor Geese in numbers.
Sibley Field Guide to Birds of Eastern North America
The book that splits Canada from Cackling.
David Allen Sibley's Eastern North America guide is the standard reference. The goose plates show all seven species side-by-side at the same scale, with the field marks you actually need at distance. The 2014 second edition reflects the Cackling Goose split.
- Hand-painted plates with all seven goose species at the same scale
- Range maps for every species, updated 2014
- Compact format - fits a coat pocket
Sibley · 2nd Ed.
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The bottom line
Seven species, four flyways. The Canada/Cackling split is the only genuinely difficult call. The rest will sort themselves once you’ve seen them next to each other in a refuge or beside a Sibley plate.
For more on goose biology, see Canada goose behaviour and how long they live.
