Nice pics, the rookery near my house (100 yds.) is still a bunch of nests sitting in leafless trees waiting for the Herons and Spring.
They are usually back before the leaves come out on the cottonwoods. Any day now!
Ken
I think your Blue Herons are a little more colorful than mine.
I will try to get a picture when they all arrive. Two pics same area. Almost in town on the Yellowstone R.