My wife and I were out for a walk the other day by a river. Was watching a great blue heron fly over. When it got to the other side of the river from us, I noticed it got to some trees behind the bank trees and started flapping like it was going to land in the top of the trees. Never seen that before. Well, then I noticed through some breaks in the branches that it landed on a pile of sticks in the top of the tree. A nest! Then I saw a bunch of other things moving and it was a bunch of herons on a bunch of nests all in one tree. I've heard of heron rookeries, and have seen them in books, TV, etc... but never seen one in person. No way for me to get a decent picture with a camera from that far away, with all the other branches in the way. Pretty neat to see that after all these years.