Cackling goose

　It was once considered the same species or a subspecies of the larger Canada Goose, primarily inhabiting North America. However, due to differences in size, bill length, and vocalisations, it is now classified as a separate species.

　Similar to the Canada Goose being classified into numerous subspecies, the Crackling goose is also classified into five or more subspecies. Originally, geese and ducks exhibit greater inter-species hybridisation compared to other birds. The subspecies of the Canada Goose and Cackling goose are groups formed by each subspecies, or un scholar even suggest these groups can be classified into six species and 200 subspecies, making classification highly complex.

　Conversely, in Japan, the Canada Goose was artificially introduced, leading to genetic disruption through hybridisation with the Canada Goose. Unlike the Cackling goose, which is designated as an endangered species, the Canada Goose is classified as an invasive alien species and targeted for control.

　Thanks to conservation efforts in Japan, their numbers are increasing, with the majority wintering in the area centred around Lake Izunuma. They roost at Lake Kabukuri to the south of Lake Izunuma and are easily spotted during the day in the nearby rice fields.