Elapidae
Olive Whip Snake
Demansia olivacea
A very slender whipsnake of the Top End and northern Kimberley, with reported facial markings.
Venomous
Identification and appearance
A very slender northern whipsnake, usually grey-brown to brown with little body pattern. Dark facial streaks and a comma-like mark from the eye toward the mouth are reported, but should never be inspected at close range.
Other names
Marble-headed Whip Snake
Typical length
Shea and Scanlon (2007) measured 101 specimens: mean snout–vent length 359.6 mm, maximum 643 mm. These exclude the tail and are not a typical adult total-length range.
Body build
slender
Head appearance
Dark facial streaks and comma-like eye-to-mouth mark
Key identification features
- Very slender grey-brown to brown body
- Dark facial streaks
- Comma-like mark from the eye towards the mouth
Where it is found
The Top End of the Northern Territory and the northern Kimberley of Western Australia.
Reproduction
Egg-laying
Medical significance
The sources checked document venom but do not establish species-specific effects in people. Treat any possible bite as an emergency and call 000.
What to do if you encounter one
Keep your distance and leave the snake a clear route away. Do not handle it, chase it for a photograph or attempt to inspect its mouth. If it is inside a building, keep people and pets clear and contact a qualified local snake catcher.
Taxonomy notes
The 2007 revision restricted this species to the northern Kimberley and the Top End. Older accounts used a broader species concept; their size and clutch figures may combine species now treated separately. The Reptile Database still lists western Queensland, which is not included in the restricted range of the revising paper; that discrepancy remains unresolved here.
Sources checked
- Australian Reptile Online Database — Olive Whip Snake (2026-09-25)
- Australian Museum — Shea and Scanlon 2007 whipsnake revision (2026-09-25)
- The Reptile Database — Demansia olivacea (2026-09-25)
- ANZCOR — First Aid Management of Australian Snake Bite (2026-09-25)
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A profile is a guide, not a reason to approach or handle a snake.