snrub, I wonder if you're seeing great white egrets? Ours are much harder to move than the blue herons. The egrets will just jump from tree to tree when I shoot in their direction(warning shot only, as they're a protected species), and I'll literally have to chase them tree by tree off the property. Our blue herons will leave when they hear our Mule start. They know what's coming next.
Our blue herons and egrets seem to be most active at dusk and dawn when the water's calmer and the sun is lower.
