Who's There?

This morning I let the geese out to free range as usual, but instead of feeding them right away, I went back inside.  About 30 minutes later I heard banging on the metal trash cans where I store the feed outside the back door.  I didn't think much about it, as the chickens frequently clean up any spilled food around the trash cans.  5 minutes later there was knocking at my back door.  The gander had climbed up the back stairs and was knocking at the door!