Adoptees under the BU bridge

Kathy reports there's a gaggle of geese under the BU bridge. By itself, no big deal, except the goslings are now big enough to notice that while some are obviously the spawn of the white adult geese that watch over them, some have the black legs of Canada geese:

... So it looks like maybe some Canada gooselings imprinted on domesticated parents. So what type do you think these Canadas will try to mate with when they grow up?