@Sidonie: I'm not sure about the others, but this one thinks I said something bad about his sister one time, (which I TOTALLY DIDN"T,) and has been like this ever since.
Great Duck Shot! The one who is the centre of attention looks as though he is giving you the evil eye! Love all your bird shots - they are just fabulous.
He is planning his Vendetta maybe he got tired of the duck that was trying to catch your attention the other days (the one moving the wings), or maybe he is concluding the Nutrias place Invasion plans!