This Snake’s Tail Does the Best Spider Impression You’ll Ever See

Written by Sharon Parry
Published: February 13, 2024
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The first time you watch this clip, you will think that a snake is being remarkably patient with a spider that is leaping around its tail. You feel that any minute now, the reptile will pounce, and the spider will end up as its next meal! But watch the clip again, and it becomes clear that there is no spider. You are watching the very tip of the snake’s tail, which looks exactly like a spider. This is the aptly named spider-tailed horned viper (Pseudocerastes urarachnoides), and there is a very good reason for them having such a unique tail.

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Where Do These Snakes Normally Live?

The spider-tailed horned viper can be found in western Iran and in some regions of Iraq. They are most common on the western side of the Zagros Mountains. Sadly, their already small range is getting smaller! When it comes to habitat, they have a preference for gypsum rocks with deep cracks at high elevations. During the day, they bask under bushes.

The species was not officially recognized until 2003. Before that, it was thought to be another species of snake that had a deformity or a parasite on its tail.

Why Do They Have a ‘Spider Tail’?

The spider-tailed horned viper (Pseudocerastes urarachnoides) isolated on a white background.

The spider-tailed horned viper uses its tail as a lure.

©reptiles4all/Shutterstock.com

This superb mimicry is aimed at the snake’s prey. Scientists believe that it is used as a lure to attract birds and have found evidence that these spiders eat larks. Also, these spiders produce a toxin that is especially effective on birds. However, it is also thought to affect mammals and amphibians. There are no recorded envenomations of humans, and so the effect that the venom would have on us is still unknown.

Do Any Other Snakes Use Lures?

Yes, this method of attracting prey is found in other snakes. The scientific name is ‘caudal luring’ and it is a type of aggressive mimicry. For snakes, the end of their tail is the ideal body part to mimic another animal. Not all snakes have tail tips that look like spiders; some look like worms or other invertebrates. The Sahara sand viper’s tail looks like an insect larvae. It buries almost its entire body in the sand with just its eyes and tail tip above the surface. Once an unsuspecting lizard tries to grasp the “larva,” it gets pounced on and eaten. In some snake species, this method is only used by younger snakes, but in others, it is used by adults as well.

The photo featured at the top of this post is © reptiles4all/Shutterstock.com

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About the Author

Dr Sharon Parry is a writer at A-Z animals where her primary focus is on dogs, animal behavior, and research. Sharon holds a PhD from Leeds University, UK which she earned in 1998 and has been working as a science writer for the last 15 years. A resident of Wales, UK, Sharon loves taking care of her spaniel named Dexter and hiking around coastlines and mountains.

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