big cypress bio ecosystem everglades Florida golden grass grassy landscapes landscpe plant sawgrass slough south swamp trough water wetland wetlands alligator alligators amphibian caiman crocodile crocodiles dinosaur gator gators leather predator reptile reptiles scales atlantic Atlantic Ocean boat coast deep gulf ocean ocean view reef ripple saltwater salty sea shallow wave wet canal horizon landscape nature park peligro reed reeds tree trees warning animal aquatic avian beak bird bridge brown pelican feather feathers fish fishing gullet pelican wildlife