May 24, 2025
Think only snakes are venomous? Think again. Some lizards pack a toxic punch, too. Here's a list of the world’s most poisonous lizards, dangerous, fascinating, and not to be messed with.
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Native to the southwestern U.S., the Gila Monster has a venomous bite used for defense. Its venom can cause extreme pain, swelling, and breathing difficulties in humans.
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This lizard’s bite delivers a powerful neurotoxic venom. Found in Mexico and Guatemala, it is one of only a few truly venomous lizard species on Earth.
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Komodo dragons kill prey with venom that prevents blood clotting, leading to shock. Combined with sharp teeth and bacteria, their bite can be deadly.
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This Australian monitor lizard secretes mild venom that can cause swelling and blood thinning. Its bite is painful but rarely dangerous to humans.
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Found in Africa, Nile monitors are aggressive and secrete mild venom that may cause infections. Their powerful jaws do most of the damage.
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While not highly venomous, this African lizard has toxic saliva and sharp teeth. A bite can cause bleeding, swelling, and secondary infections.
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This giant lizard from Asia carries venom in its glands. Although not fatal, its bite can cause severe pain, infection, and tissue damage.
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Australia’s largest lizard, the Perentie, has venom glands producing mild toxins. It’s more likely to escape than fight, but its bite should be treated seriously.
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Another venomous Australian monitor, the Argus Monitor, has toxins that reduce blood clotting. Their fast strikes and long claws make them formidable.
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Native to Borneo and rarely seen, this elusive lizard may possess venomous properties. Scientists are still studying its venom and how it affects prey.
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