Being a duckling can be tough. Between the growing and the learning to fly business, there's not a whole lot of time to second guess yourself.
Which is probably how Charley the duckling ended up thinking that this man with a camera is his mother.
He has no trouble keeping up, though. Just watch him in this video from 2010, sprinting like a pro and match his human counterpart pause for pause.
As far as stalkers go, this is pretty much the best case scenario.