A bit more luck with those ducks! But this time the luck was made by a bit of practice, and perhaps a few years experience.
Classic photography is often about giving careful thought and planning to the shot. Shooting in the African bush taught me something different. Very often you may be moving through the bush, either on foot or on a road in a vehicle, and a photo opportunity will present itself. Often it will be an animal of some kind, which will react to your presence. Assuming that your first instinct is not to be somewhere else in a big hurry, you need to grab the shot and then stop and think about the next shot. To do this effectively means carrying the camera ready to shoot, with some care that the settings are right for the situation at any time.
The ducks, above, were exactly that. The camera was set at aperture priority, one stop from wide open on ISO 400, with some certainty that it could deal with most conditions at that moment. The ducks flew over and it was virtually a point and shoot situation. Luck came into play in ensuring that at least one focus point found the right mark. ISO 200 may have been fast enough, and given less noise in the cropped image, though that can be fixed.