To the present species were assigned:*Richardson's cackling goose ("Branta hutchinsii hutchinsii")*Aleutian cackling goose ("Branta hutchinsii leucopareia")*Small cackling goose ("Branta hutchinsii minima")*Taverner's cackling goose ("Branta hutchinsii taverneri")*†Bering cackling goose ("Branta hutchinsii asiatica")—doubtfully distinct from "B. h. leucopareia"; extinct (c.1929)The distinctions between the two geese have led to a great deal of confusion and debate among ornithologists.
Малая канадская казарка образует 5 подвидов, один из которых уже вымер:* "B. hutchinsii hutchinsii"* "B. hutchinsii leucopareia" — Средняя канадская казарка* "B. hutchinsii minima"* "B. hutchinsii taverneri"* "B. hutchinsii asiatica"* Identification and range of subspecies within the (Greater) Canada and (Lesser Canada) Cackling Goose Complex (Branta canadensis & B. hutchinsii)