Louisiana's river swamp Atchafalaya, along the river of that name's path to Mexican Gulf, is the world's longest in its stream-bordering kind, an extremely complex habitat. It harbors a rich fauna, including the red 'bobcat' lynx and a brown bear subspecies, partly being monitored as contact with humans endangered various populations, but new balances are also found, like alligator farming with dug-up eggs. A dam forced sea-river-migrating species to retreat here instead of swimming further inland, making the reserve even more vital.