The blue-black Indigo Snake is thought by many to be more responsive than other snakes, and in times past was a favorite of circus performers. At a record size of 8.5 feet in length, it is North America’s longest snake. Now federally protected, Indigos are very active and need huge enclosures; high metabolisms translate into hefty food bills and cleaning chores. Their spectacularly-marked Latin American cousins, the Cribos, get even larger – to 10+ feet. Both take well to captivity, but are best left to serious, adult keepers.