Well, in this case a gentlemn named Robert? Canada is said to have first identified this goose, so it's named after the naturalist...and so it is always Canada goose or Canada geese...Canadian, in this case, is just lazy incorrectness. I've searched the web for the citation but can't come up with it, perhaps I have the name wrong. The info is contained in many naturalist and birding literature I've seen, though. Boby?...praps you have a clue here?

The Only WO'N!