Smithsonian Magazine · People & society

Spider-Tailed Viper's Bizarre Tail Has Surprisingly Normal Bones

The spider-tailed horned viper uses a unique tail appendage resembling a spider to lure birds, but new research reveals its underlying skeletal structure is unexpectedly ordinary.

This viper's tail features elongated scales that form a bulbous lobe, mimicking an arachnid's appearance and movement to attract avian prey. This hunting strategy is considered unique among reptiles.

Despite the tail's elaborate external structure, a detailed 3D analysis of the snake's skeleton, published in The Anatomical Record, shows its vertebrae are "bizarrely normal."

The study provides the first in-depth examination of the spider-tailed horned viper's vertebral anatomy, an area often overlooked in herpetology despite the diversity of snake spinal structures.

Researchers created 3D models of the viper's skeleton using X-ray computed tomography, focusing on variations in its vertebrae across different body segments.

This detailed documentation makes the spider-tailed horned viper one of the best-studied viper species in terms of its vertebrae, potentially aiding future paleontological identification of fossilized snake remains.

The findings highlight a challenge for paleontology: a skeleton alone may not reveal an animal's external morphology or specialized features, as the viper's normal bones give no clue to its spider-like tail lure.

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