Texas indigo snakes are predominantly black in color, with a high sheen which gives their scales an amazing iridescence. Their underside is often a salmon pink color. They are a large snake, regularly attaining lengths beyond . Eight foot long specimens are not unheard of.
Texas indigo snakes prefer lightly vegetated areas not far from permanent water sources, but are also found in mesquite savannah, open grassland areas, and coastal sand dunes. They den in burrows left by other animals.
Indigo snakes are diurnal snakes, and spend most of their time actively foraging for prey. They will consume almost anything they can overpower and swallow, including mammals, birds, lizards, frogs, turtles, eggs, and even other snakes, including rattlesnakes. Hence the adage, "If it's an Indigo, let it go." They are not a typically aggressive snake, but may bite or release a foul smelling musk from its cloaca if handled or harassed. Like many colubrid snakes, it will often shake its tail as a warning - even though it does not possess a rattle.
Breeding takes place, generally yearly, in the winter. Clutches that average 10-12 eggs are laid in the spring, and hatch around 80 days later. Hatchlings can be up to 26" long. Maturity is reached in 2-3 years.
The Texas indigo snake is listed as a threatened species by the state of Texas. Its primary threat is from habitat loss due to human development. Each snake requires a large home range to forage, and urban sprawl is shrinking their usable habitat. Roads bisect their territory, and many snakes each year end up run over by cars.