There sub-species as well B.c. canadensis, B.c. maxima, B.c. interior, B.c. moffitti, B.c. fulva, B.c. occidentalis and B.c.parvipes.
Branta refers to the goose type – Branta covers all ‘black’ goose species like Canada geese, Hawiian geese and Barnacle geese (Anser refers to ‘grey’ geese like greylag geese, white fronted geese).
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