The deadly illusion of the snake that mimics a viper

Nature · Published 18 October 2026 Swipe more like this →

In short: With a triangular head and robust body, the death adder looks like a viper. But this Australian predator is actually an elapid, using a deceptive tail to lure prey into a strike that can lead to total respiratory failure.

The genus *Acanthophis*, established by French naturalist François Marie Daudin in 1803, is a master of convergent evolution. While their physical traits—such as triangular heads and vertically elliptical pupils—closely resemble true vipers (family Viperidae), they actually belong to the Elapidae family, alongside cobras and mambas. This physical resemblance is paired with a unique hunting strategy: rather than actively chasing prey, these snakes use 'caudal luring,' wiggling a worm-like tip on their tail to attract lizards and small mammals.

The venom of the common death adder, *A. antarcticus*, is exceptionally potent, with an average injection of 40–100 mg per bite. While some research highlights neurotoxic, hemorrhagic, and hemolytic effects, the venom is primarily characterized by its neurotoxicity. This can trigger a progression of symptoms leading to complete respiratory paralysis, typically within 6 to 12 hours. Historically, before the widespread availability of antivenom, approximately 50% of bites were fatal.

Taxonomically, the genus remains a subject of scientific debate. While eight species are currently listed by ITIS, estimates of the total number of *Acanthophis* species range from 4 to 15. Recent studies have moved away from older classifications, such as grouping all New Guinea varieties under *A. antarcticus* or *A. praelongus*, instead identifying distinct clades like the smooth-scaled *A. laevis* complex and the rough-scaled *A. rugosus* complex. This ongoing refinement highlights the incredible biological diversity within this group of highly venomous predators.

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