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| | Canada Goose subspecies |
 | | In the early 1950s, it was split up into 12 subspecies, of which two were believed to be extinct though one, the Giant Canada Goose, was later found still to exist. |
 | | At the time, it was thought that all the subspecies were separated geographically, at least on the breeding grounds if not entirely in winter. |
 | | Even as early as the 1970s, one researcher, working by Hudson Bay where two subspecies breed, was talking about a 'complex' of mixed subspecies as he was no longer able to identify many of the pairs he was studying. |
| www.birdsofbritain.co.uk /features/mao-jan-01.htm (526 words) |
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