This video from the USA says about itself:
28 January 2016
Despite its similar appearance, a smaller Cackling Goose in New York stands out among the larger Canada Geese surrounding it. The Cackling Goose was long considered just a small race of the Canada Goose, but the smallest four of the eleven recognized races were determined to be distinct enough to be their own species. The smallest form of the Cackling Goose is only a quarter the size of the “Giant Canada Goose” subspecies.
Cackling Goose. Making a Long-awaited Comeback to the Sky in Japan: here.