I began watching the heron rookery in about mid March this year and I have made several trips there since. On my first trip to the park in March I was able to stand on parts of the river, along the shore, that were still frozen. By the end of March all of the ice had melted and the Mississippi river had flooded its banks. This made it more difficult to get good pics because many of the locations that had the best view of the rookery were flooded out.
On my last visit, which was April 9th, the Mississippi had resided quite a bit and I was able to get some better pics. At this point most of the herons were paired up and going through the nesting rituals. Both of these pics are of male herons, who's job it is to go out and find sticks to bring back to the nest. He will then present them to the female, who stays at the nest, and she will use the sticks to remodel the nest.