Gosh, migratory simply means that they aren't here all year ... and they weren't, twenty years ago (in SWO). Yeah, you might occasionally see one (heck, you could occasionally see a golden eagle - I did) but now you can see at least several of them 365 days a year. They still leave northern Ohio for the winter (think Hinckley!)
Same for the evil Canada goose ... they must not be tasty, the way they are multiplying. But in '84 they were a novelty certain times of the year; now they are pests 365 days! (I like 'em, myself ... but I also like starlings, crows, and grackles.)