These are Canada Goose (one) or Canadian Geese (many). I thought they migrated but only offspring from migrating geese migrate. The ones born to non-migrating geese stay put.
Geese supposedly poop when they take off... to lighten the load ??. Perhaps they also poop when flying. I don't know.
A no-no if you want to avoid Goose poop
So I guess to avoid an over-supply of goose poop in your yard, you just go out and ask them to waddle over somewhere else and for heaven's sake don't scare them into flying.