The taxonomy of this group is complex and remains uncertain. Writing
in the 1940's, J. W. Aldrich pressed for splitting Canada Goose
into two species, a large Canada Goose (B. canadensis) and
a smaller polytypic species, the Tundra Goose (B. hutchinsii).
This separation is supported by more recent mitochondrial DNA analysis.
Observers are therefore strongly encouraged to document any small
Canada Geese seen in NY State, preferably with photographs.