Snake Identifier
Eastern Indigo Snake (Drymarchon couperi)
Eastern Indigo 001 by Ltshears, via Wikimedia Commons, licensed under CC BY-SA 3.0
Colubrids

Eastern Indigo Snake

Drymarchon couperi

The longest native snake in North America, a glossy blue-black giant known for its docile nature and association with gopher tortoise burrows.

Venomous?
Non-venomous
Adult length
1.8-2.6 m (6-8.5 ft), exceptionally over 2.7 m (9 ft)
Range
Southeastern United States, primarily Florida and southern Georgia

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Overview

The Eastern Indigo Snake is North America's longest native snake species, renowned for its iridescent blue-black sheen and impressive size. Historically found throughout the southeastern coastal plain, its range has contracted significantly and it is now a federally threatened species, closely tied to the presence of gopher tortoise burrows for winter shelter.

Despite its imposing size, this species is generally docile and non-venomous, relying on physical strength to subdue prey rather than constriction in the traditional sense, often pinning prey against the ground.

How to identify it

  • Large, heavy-bodied snake with smooth, glossy scales
  • Uniform iridescent blue-black to purplish-black dorsal coloration
  • Chin, throat, and sometimes cheeks often washed with reddish-orange or cream
  • Large, broad head not sharply distinct from a thick neck
  • Round pupils; large eyes
  • Distinguished from black racers by much greater bulk, glossier sheen, and reddish throat coloring

Habitat & range

Inhabits sandhill scrub, pine flatwoods, hammocks, and agricultural edges, especially where gopher tortoise burrows are available for refuge during cold weather and droughts. Also uses floodplain forests and coastal dunes in warmer months, ranging widely across a large home range.

Behavior, diet & reproduction

Diurnal and active, often seen moving across open ground in search of prey. Generally calm and rarely aggressive, though it may vibrate its tail or flatten its head when threatened. An active, wide-ranging predator that consumes a broad variety of prey including rodents, birds, frogs, other snakes (including venomous species), and small alligators. Breeding occurs in winter and spring, with females laying eggs in late spring.

Frequently asked questions

Is the Eastern Indigo Snake dangerous?

No, it is non-venomous and generally docile, though a large individual may bite defensively if provoked.

Why is it called an indigo snake?

Its scales have an iridescent blue-black sheen that resembles the color indigo.

Why is this species protected?

It is federally threatened due to habitat loss and its dependence on gopher tortoise burrows, which have also declined.

Does it eat venomous snakes?

Yes, it is known to prey on other snakes, including venomous species, as part of its varied diet.