Keep trying for birds in flight. The mallards are the fastest flying ducks. I like the pintails. ( photo / image / picture from Kildale's Garden ) ( photo / image / picture from Kildale's Garden )
I've only once seen a Pintail in the wild. Sadly it was only visible through a pair of binoculars. You've managed to catch both the Mallard and the Pintail brilliantly in flight. It's something I really need to work on as I usually only manage to get a tail or a blur.