
Photographed in the Mount Isa area, Queensland.
Elapidae
Sombre Whip Snake
Demansia quaesitor
The Sombre Whip Snake is a small venomous snake of northern Australia with brown to black colouring, a paler head and a dark nape collar. It occurs in tropical and semi-arid woodland.
Venomous
Identification and appearance
The Reptile Database describes a blue-grey to orange-brown head paler than the body, a dark streak across the snout, a dark teardrop behind the eye and a narrow dark collar. AROD records brown, yellowish-brown to black colour variation.
Typical length
The Australian Museum revision reports mean SVL 36.15 cm and maximum SVL 56.5 cm from mixed-size specimens; these are not total length and do not establish typical adult size.
Head appearance
pale blue-grey to orange-brown head, dark teardrop behind eye
Key identification features
- Head paler than the body
- Dark snout streak, postocular teardrop and nape collar
- Tropical and semi-arid woodland range
Where it is found
Core records extend from the east Kimberley through Arnhem Land into north-western Queensland; the 2007 revision treats Koolan Island and peripheral north-west Queensland records as tentative.
Diet
Presumably mostly lizards.
Reproduction
Egg-laying.
Medical significance
Species-specific clinical effects are not established in this profile. For any suspected bite, call 000 and follow snakebite first aid without waiting for identification.
What to do if you encounter one
Keep your distance and leave it a clear route away. Contact a qualified snake catcher if it is trapped near people.
Similar-looking snakes
No pairwise lookalike link is included without a direct source comparison. Do not approach a whip snake to inspect facial markings.
Taxonomy notes
The current name Demansia quaesitor replaced earlier use of Demansia olivacea for this tropical whipsnake form. The 2007 revision treats Koolan Island and peripheral north-west Queensland records as tentative.
Sources checked
- Australian Reptile Online Database — Sombre whipsnake (2026-09-25)
- The Reptile Database — Demansia quaesitor (2026-09-25)
- Shea & Scanlon 2007 — Revision of the tropical whipsnakes (2026-09-25)
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A profile is a guide, not a reason to approach or handle a snake.