Coastal Louisiana is a vast and dynamic tapestry of forests, swamps, marshes, river channels, estuaries and islands. The region provides habitat for countless wildlife, including birds, fish, mammals, amphibians and unfathomable multitudes of smaller organisms that support the entire food web of this region. Taken together, these habitats make up one of the largest and most productive wetland ecosystems in North America. But the tapestry continues to unravel as Louisiana’s coast vanishes, and more and more organisms lose the habitats they need to survive.

CRCL Estuary Graphic - Restore the Mississippi River Delta CoalitionWhere the Mississippi River meets the Gulf of Mexico, the deposition of rich sediments and co-mingling of fresh river water and warm salt water gives rise to a spectacular flowering of life – a veritable frenzy of biological productivity.


Roseate Spoonbill - Restore the Mississippi River Delta Coalition

Bottomland hardwood forests and cypress-tupelo swamps in the upper reaches of the Mississippi River Delta provide habitat for a host of neotropical migratory songbirds, ducks, wading birds and other forested wetland species, including the rapidly declining Rusty Blackbird. The delta’s fresh, brackish and salt marshes are home to terns, wading birds, shorebirds and secretive marsh birds, including Clapper Rails and Seaside Sparrows. The delta’s islands support staggering concentrations of breeding waterbirds, including the Brown Pelican (Louisiana’s state bird), wading birds (herons, egrets, spoonbills, and ibises), terns, gulls and shorebirds.

For millions of birds that traverse the Mississippi Flyway each year, the delta’s food-rich habitats are the last stop before a grueling 500- to 600-mile nonstop flight across the Gulf of Mexico in the fall — or conversely in the spring, a desperately needed refuge for hungry and exhausted birds returning north across the Gulf. The collapse of the delta threatens not only its year-round residents, but also some of North America’s most colorful and iconic backyard birds and other species — birds whose lives quite literally span the hemisphere, from the high Arctic tundra to Tierra del Fuego.


Many mammals also rely on the delta’s habitats and food resources, from Louisiana black bears in forested regions to bottlenose dolphins in productive estuaries. Even sperm whales in deep waters offshore, where the delta’s abundance concentrates food resources for these marine giants, depend on a healthy delta.

At least 100 threatened Louisiana black bears live in the Atchafalaya Basin, where conservationists are working to protect them and provide habitat corridors to connect isolated bear populations. Other mammals in the Mississippi River Delta include minks, muskrats, beavers, armadillos, foxes, coyotes and bobcats. Introduced nutria and feral hogs are also present and often prove very destructive to native ecosystems and species.

Fish, shellfish, reptiles and amphibians

Crawfish - Restore the Mississippi River Delta Coalition

The delta’s estuaries and wetlands provide nurseries and spawning grounds for huge numbers of aquatic organisms, from commercially important seafood species (crawfish, shrimp, blue crabs, menhaden, drum and others) to alligator gar, paddlefish and the endangered pallid sturgeon. The delta’s once-great oyster reefs are today significantly reduced but still provide an important resource for other wildlife and for humans alike.

Though well-known for its significant population of American alligators, the delta also provides vital habitat for other reptiles, including the Mississippi diamondback terrapin and several species of snakes and sea turtles. Frogs and toads of many varieties contribute to the delta’s “soundtrack,” especially on summer evenings, when their calls, bleats, croaks and trills can be almost overwhelming.