--- title: "Deathstalker Scorpion (Leiurus quinquestriatus) | AnimalTracks.wiki" description: "A desert scorpion about as long as a credit card, one of the most dangerous on Earth, whose venom yielded chlorotoxin, a peptide used in cancer research." image: "https://animaltracks.wiki/images/animals/deathstalker-scorpion-1.webp" published: "2026-09-05" updated: "2026-09-27" --- # Deathstalker Scorpion (*Leiurus quinquestriatus*) > **Status**: Checked against 5 sources, listed under Sources below. > **Tagline**: A desert scorpion about as long as a credit card, one of the most dangerous on Earth, whose venom yielded chlorotoxin, a peptide used in cancer research. > **Soundtrack Vibe**: French Dark Electro & EBM // Gesaffelstein, "Pursuit" > **Soundtrack Links**: [Spotify](https://open.spotify.com/track/2jJIxT6WAIVWzDo3Ou53Q0) | [YouTube](https://www.youtube.com/watch?v=oRSijEW_cDM) > **Vibe Match**: Cold, mechanical precision, like a hunter that works by touch. It reads the direction and distance of prey from vibrations picked up by slit-shaped sensory organs near the tips of its legs. ## Biological Superpowers & Stats - **Taxonomy**: *Leiurus quinquestriatus* - **Danger Level**: Deadly - **Conservation Status**: Not Evaluated ([IUCN Red List](https://www.iucnredlist.org/)) - **Superpower**: A venom peptide, chlorotoxin, that binds brain tumor cells and, built into the dye tozuleristide, made gliomas glow in a trial published in 2019 - **Habitat**: Arid and hyper-arid desert of north-east Africa, from Algeria and Niger to Sudan and Somalia - **Diet**: Insects, spiders, centipedes, earthworms, and other scorpions - **Tags**: desert, venomous, nocturnal, carnivore, arachnid ## Natural History & Behavior ## A Small Hunter With an Outsized Reputation The deathstalker (*Leiurus quinquestriatus*) is a scorpion in the family Buthidae, yellowish in color with brown spots on its tail. An adult runs 80 to 110 millimeters long, about the length of a credit card or a little more, and weighs just 1 to 2.5 grams, about as much as a few paperclips. Animal Diversity Web calls it one of the most dangerous scorpions on Earth because of its potent venom. In north-east Africa it is recorded from Algeria and Niger to Sudan and Somalia, where it lives in arid and hyper-arid desert. Its Middle Eastern subspecies was raised to a separate species, *Leiurus hebraeus*, in 2014. Deathstalkers are nocturnal, a habit that helps them manage heat and water balance in dry habitats. They shelter under rocks, move into another animal's abandoned burrow, or dig one of their own, about 20 centimeters below a rock. Scorpions do not see well, and deathstalkers hunt by touch: tiny slit-shaped sensory organs near the tips of their legs pick up vibrations in the sand or soil, which help them judge the direction and distance of prey. They generally eat small insects, spiders, centipedes, earthworms, and other scorpions, using their pincers to crush a catch and pull it toward the mouth. ## Its Venom's Second Career: Finding Tumors Chlorotoxin, a toxin originally isolated from deathstalker venom, is used in cancer research. It is a peptide, a short chain of the same building blocks that make up proteins. It binds to the surface of glioma cells, a type of brain tumor, and impairs their ability to invade nearby tissue. Researchers traced that binding to a protein called matrix metalloproteinase-2, or MMP-2, which gliomas make more of than usual but the healthy brain does not normally make. > **A toxin that paints its target** Attach a near-infrared fluorescent dye to chlorotoxin, and the probe marks tumors apart from the healthy tissue next to them. In mouse experiments published in 2007, it outlined gliomas and four other kinds of cancer. A version for people followed: tozuleristide, which pairs chlorotoxin with a near-infrared dye called indocyanine green. In a phase 1 trial, an early test of a drug's safety in people, 17 adults with suspected gliomas each received a single dose before surgery. No dose-limiting side effects were seen, no reported problems were blamed on the drug, and the tumors gave off a fluorescent signal. The researchers, publishing in 2019, concluded the dye may be useful for fluorescence-guided surgery, in which a glowing marker helps surgeons tell tumor from healthy tissue. ## Built to Multiply, Built to Be Eaten Little is known about how deathstalkers breed, but a female gives birth to 35 to 87 live young. Deathstalkers are themselves commonly eaten by members of their own species and by other scorpions, and centipedes and vertebrates prey on them too. Death rates are high right after birth. ## Frequently Asked Questions ### Why does chlorotoxin stick to brain tumor cells and not healthy brain tissue? Glioma and healthy brain cells wear different molecular badges. Glioma cells are studded with a surface protein, matrix metalloproteinase-2 (MMP-2), that the healthy brain does not normally make, and chlorotoxin fits that protein almost like a key. Locking on also blocks the enzyme's work and lowers how much of it sits on the cell surface, and the researchers found those effects can explain how the toxin holds back the tumor cells' invasion of nearby tissue. *(Source: [Deshane, Garner & Sontheimer 2003]())* ### Have doctors actually tested chlorotoxin dye on human cancer patients, not just mice? Yes. A trial published in 2019 gave 17 adults with suspected gliomas a single dose of the chlorotoxin dye tozuleristide, from 3 to 30 milligrams, between 3 and 29 hours before their operation. No dose caused a safety problem, and cameras picked up a fluorescent glow from the tumors themselves, generally brighter in the more aggressive, higher-grade cases. *(Source: [Patil et al. 2019]())* ## Sources 1. [Leiurus quinquestriatus. Animal Diversity Web, University of Michigan.]() 2. [Lowe, Yağmur & Kovařík (2014). A review of the genus Leiurus Ehrenberg, 1828 (Scorpiones: Buthidae) with description of four new species from the Arabian Peninsula. Euscorpius.]() 3. [Deshane, Garner & Sontheimer (2003). Chlorotoxin Inhibits Glioma Cell Invasion via Matrix Metalloproteinase-2. Journal of Biological Chemistry.]() 4. [Veiseh et al. (2007). Tumor Paint: A Chlorotoxin:Cy5.5 Bioconjugate for Intraoperative Visualization of Cancer Foci. Cancer Research.]() 5. [Patil et al. (2019). Phase 1 Safety, Pharmacokinetics, and Fluorescence Imaging Study of Tozuleristide (BLZ-100) in Adults With Newly Diagnosed or Recurrent Gliomas. Neurosurgery.]() *Published September 5, 2026. 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Glioma cells are studded with a surface protein, matrix metalloproteinase-2 (MMP-2), that the healthy brain does not normally make, and chlorotoxin fits that protein almost like a key. Locking on also blocks the enzyme's work and lowers how much of it sits on the cell surface, and the researchers found those effects can explain how the toxin holds back the tumor cells' invasion of nearby tissue.", "citation": { "@type": "ScholarlyArticle", "name": "Chlorotoxin Inhibits Glioma Cell Invasion via Matrix Metalloproteinase-2", "url": "https://doi.org/10.1074/jbc.m205662200", "author": "Deshane, Garner & Sontheimer", "datePublished": "2003", "isPartOf": { "@type": "Periodical", "name": "Journal of Biological Chemistry" }, "identifier": "doi:10.1074/jbc.m205662200" } } }, { "@type": "Question", "name": "Have doctors actually tested chlorotoxin dye on human cancer patients, not just mice?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. A trial published in 2019 gave 17 adults with suspected gliomas a single dose of the chlorotoxin dye tozuleristide, from 3 to 30 milligrams, between 3 and 29 hours before their operation. No dose caused a safety problem, and cameras picked up a fluorescent glow from the tumors themselves, generally brighter in the more aggressive, higher-grade cases.", "citation": { "@type": "ScholarlyArticle", "name": "Phase 1 Safety, Pharmacokinetics, and Fluorescence Imaging Study of Tozuleristide (BLZ-100) in Adults With Newly Diagnosed or Recurrent Gliomas", "url": "https://doi.org/10.1093/neuros/nyz125", "author": "Patil et al.", "datePublished": "2019", "isPartOf": { "@type": "Periodical", "name": "Neurosurgery" }, "identifier": "doi:10.1093/neuros/nyz125" } } } ] }, { "@type": "MusicRecording", "name": "Pursuit", "byArtist": { "@type": "MusicGroup", "name": "Gesaffelstein" }, "genre": "French Dark Electro & EBM", "url": "https://open.spotify.com/track/2jJIxT6WAIVWzDo3Ou53Q0" } ] } ```