Beautiful capture. You are lucky to have many water fowls close by. I have just returned home from a two hour walk along the coast in hot weather and I only saw 2 o 3 egrets at the Salini Salt Pans. This is another lovely capture. The big bird with russtled feathers is new to me.
It's so great to see several types of birds living together.
You suggest shutter priority what Exposures settings do you use