Field Museum Scans Rare Spider-Tailed Viper Tail

New imaging confirms the snake's unique lure is made of skin and scales, not bone.

Updated on Oct. 20, 2026 in Reptiles

Isometric editorial illustration of a biological viper tail model featuring spider-like appendages on a clean pedestal, representing scientific research. — Researchers at the Field Museum used high-resolution CT scanning to confirm that the spider-tailed horned viper's tail lure consists of scales, not bone. AI Illustration. Upload story photo >

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Scientists at the Field Museum in Chicago utilized a high-resolution CT scan to investigate the anatomy of a spider-tailed horned viper. The scan revealed the snake's signature tail tip is composed entirely of fused scales rather than specialized skeletal structures.

Why it matters

Understanding this unique anatomical adaptation helps researchers confirm how the viper effectively mimics a spider to lure birds. The scan settles long-standing questions regarding whether internal bone structures were responsible for the lure's movement.

The scanning process lasted 44 minutes and resulted in 3,848 individual X-ray images. The specimen's skeletal structure contains 32 vertebrae in the tail alone, out of 183 total vertebrae.

The players

Field Museum

Located in Chicago, this institution is a major global natural history museum that conducts extensive biological research.

The details

Researchers at the Field Museum used their new X-ray scanning lab to create a 3D model of the specimen, which was originally collected in Iran in 1968. By keeping its body still and twitching only the scaly tail tip, the snake mimics the appearance and movement of a crawling spider to attract prey.

1968: The first specimen was collected in Iran.
2003: A second specimen of the species was discovered.
2006: The spider-tailed horned viper was formally described as a new species.
Late 2024: The Field Museum opened its new X-ray scanning lab.

Roadmap

This scan is part of a broader trend of digitizing natural history collections to allow for non-invasive anatomical studies. By utilizing the Field Museum's X-ray scanning lab, researchers can analyze rare specimens without damaging the delicate original tissues.

Readers and students can access these high-resolution 3D models remotely to view the specimen's anatomy in detail. These digital resources provide a unique look at evolutionary biology without the need to visit the museum in person.

The takeaway

This discovery highlights how natural selection can create elaborate physical lures through the adaptation of simple skin and scales. These findings serve as a reminder that complex behaviors, such as mimicry, often rely on specialized but non-skeletal anatomical features.