Canada geese seem to have a tendency to move from one place to another in single file. Sometimes, when there are a lot of them, this can be quite an impressive sight. When I see them moving over water like this they remind me of the British Grand Fleet sailing to the Battle of Jutland. Earlier this year, I saw 50 or 60 of them moving like this down through the middle lake to the bottom lake in Reading University grounds. Just this evening I saw 18 of them proceeding in single file down the Kennet, with a Greylag goose at their head.
This must have been the picture I was thinking of: http://en.wikipedia.org/wiki/Image:Grand_Fleet_sails.jpg (It probably has nothing to do with the Battle of Jutland.)