Just after daybreak on this unreasonably cool, late August morning we walked to the Wreck, a hike that traversed two ecosystems, and witnessed a bit of magic. From our house on the edge of the Pleistocene terrace where the historical forest was a mix of upland hardwoods and pines, we descended into the bottomland hardwood forest of the Bayou D'Arbonne floodplain. The descent was only thirty feet, but for the biota it was as drastic as 3,000 feet on a Colorado mountain.