This majestic eastern indigo snake Drymarchon corais couperi was seen in Big Cypress Swamp in the Everglades about 1980 during an exploratory trip on Turner River Road north of Alligator Alley.  My old pal Randy Grimes actually spotted it basking on a crumbling wooden bridge.  The specimens from down deep in the Glades tend to more often sport the red chin and throat, a trait usually faint or lacking in animals further up the peninsula.  This was a male approximately 6.5 feet in length.