Birds

Cackling Goose / Canada Goose Complex

Cackling Goose / Canada Goose Complex

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This entry refers to the complex group of geese historically treated as one species (Canada Goose) but now separated into two: the larger Canada Goose (Branta canadensis) and the smaller Cackling Goose (Branta hutchinsii). Field identification between some subspecies can be challenging.
Where to spot
Found widely across North America, from the Arctic tundra to temperate wetlands, agricultural fields, and urban parks. Also introduced to parts of Europe and Asia.
How to spot
Observe flocks carefully for size differences. Cackling Geese are noticeably smaller, with shorter necks and smaller bills, and often have a 'cuter' appearance and higher-pitched calls than Canada Geese. However, some smaller Canada Goose subspecies overlap in size with larger Cackling Goose subspecies, requiring careful observation of proportions and vocalizations.
When to spot
Year-round in many settled areas; migratory movements during spring and autumn are highly visible, with large flocks traveling between breeding and wintering grounds.
The scientific split of the Canada Goose into two distinct species highlights the ongoing discovery and refinement of avian taxonomy based on genetic and morphological differences, recognizing the smaller Cackling Goose as its own species.
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