Great blue herons start returning to their rookery on the Mississippi River toward the end of March. Join a Ranger at Marshall Terrace Park in Minneapolis to watch them rebuild nests and do a little flirting. If we are lucky, we might see the resident peregrine falcons fly over, as well as migrating ducks like buffleheads and goldeneye. We will be down on the banks of the Mississippi River, weather permitting. Prepare for some mud or ice. We encourage bringing…