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Snake Island is Ilha da Queimada Grande, a protected island off Brazil’s São Paulo coast and the only natural home of the golden lancehead, Bothrops insularis. The often-repeated estimate of about 3,000 snakes is approximate and based on older surveys—not a current census. The snakes are venomous and a bite could be dangerous, but viral claims that they attack people as assassins or that their venom melts flesh are false. The island is not open to ordinary tourism: landing is prohibited or restricted to authorized research and management.
Where is Snake Island?
Ilha da Queimada Grande lies about 35 kilometres offshore from Itanhaém, in the state of São Paulo, Brazil. It covers roughly 43 hectares—about 430,000 square metres—and is popularly known as Snake Island because it is home to the golden lancehead, a venomous snake found nowhere else naturally. The island is part of the federal Area of Relevant Ecological Interest (ARIE) Queimada Pequena and Queimada Grande, managed by Brazil’s ICMBio. Instituto Butantan’s overview and a 2026 peer-reviewed study describe its location, size, ecology and conservation importance.
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Are there really 3,000 snakes on Snake Island?
About 3,000 is a useful description of a historical estimate, not a verified count of the island’s snakes today. Butantan’s 2025 account attributes the approximate figure to a survey from the late 2000s; the reviewed sources do not establish a newer island-wide estimate. Butantan’s expedition report is explicit that the number is approximate and tied to that earlier survey.
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The scientific basis is more nuanced than a precise-sounding headline suggests. In a 2008 paper, Martins, Sawaya and Marques described their work as the first population estimate based on plot surveys, conducted in 2002. They noted that earlier estimates based on field experience had ranged from 3,000 to 4,000 and from 2,000 to 4,000 snakes. Their own two forest-plot surveys produced different results:
- First survey: an estimated 2,134.3 snakes, with 95% confidence limits from 1,310.3 to 2,958.3.
- Second survey: an estimated 1,304.3 snakes, with 95% confidence limits from 82.5 to 2,526.0; the authors noted that this estimate was particularly imprecise.
These are statistical estimates derived from sampled plots, not a direct tally of every snake on the island. The wide confidence limits—especially for the second estimate—show why it would be misleading to report 3,000 as an exact or current population. The studies also differ in method and date: the 2008 paper analyzes 2002 surveys, while Butantan’s later report repeats an approximate figure attributed to a late-2000s survey. The original population-estimation paper provides the methods and uncertainty behind its figures.
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The golden lancehead is a member of the Bothrops group of pit vipers, but its isolation has shaped a distinctive ecology. Adults are semi-arboreal: they use vegetation and tree canopies as well as the ground. Their diet consists mainly of small migratory birds. Juveniles eat ectothermic prey, including centipedes, lizards and small amphibians, according to the 2026 study. This shift in prey as the snakes grow is one reason sensational descriptions of the island’s snakes as a single, uniform swarm miss the actual biology.
Birds are important prey because they visit or pass through the island, while the snakes’ ability to use vegetation helps them encounter prey above ground. A person looking only at the trail or forest floor could therefore miss a snake resting in vegetation. That is a reason authorized fieldwork requires care; it is not evidence that the snakes seek people out. Butantan researcher Otavio Marques has suggested that this surprise encounter may help explain the myth that the snakes attack people. The island’s ecology is unusual, but it is not a horror-film scene of snakes deliberately hunting visitors.
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The species is described as critically endangered in the 2026 peer-reviewed article. Its restricted natural range means that harm to the island population cannot simply be offset by populations elsewhere. The ICMBio national action plan for insular herpetofauna, approved in 2010 with a five-year implementation period ending in 2015, identified reptile removal for trafficking or biopiracy, habitat loss or alteration, and lack of public understanding as conservation problems. Those are historically identified threats and priorities; the plan’s dates should not be mistaken for proof of a current program or current threat assessment.
Is the golden lancehead really deadly?
The golden lancehead is venomous, and a bite could cause a serious accident. That risk should be taken seriously, particularly because medical care is far away on an offshore island. But “deadly” is not the same as inevitably fatal, and the available evidence does not support claims that its venom is uniquely powerful or that it melts human flesh.
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Nor is there evidence in the cited research that golden lanceheads routinely attack people. They are wild animals whose normal behavior is tied to feeding and habitat, not a drive to pursue humans. In field conditions, a person could unexpectedly encounter a snake in vegetation. That possibility is one reason access is limited—not a basis for portraying the snakes as aggressive man-eaters.
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Can you visit Snake Island?
No, not as an ordinary tourist destination. Butantan says visits require authorization through ICMBio’s Sisbio system for researchers; the Itanhaém municipal coastal-management guide says landing on the island is prohibited. The 2026 study likewise describes access as restricted to researchers and environmental agencies with prior authorization. These sources support a clear practical rule: do not plan or attempt an unauthorized landing.
That restriction is not a missed sightseeing opportunity so much as a conservation and safety boundary. The island is the only natural habitat of a critically endangered species, and a landing could disturb wildlife or habitat. The snakes are venomous, and medical assistance would not be immediately at hand offshore. A research or management visit is not equivalent to a public tour, and the sources do not support presenting a commercial visitor itinerary, booking option or safe way for a tourist to go ashore.
Do not treat a boat trip past the island as permission to land. The municipal guide’s prohibition concerns landing, while the cited material does not establish general rules for every possible type of boat activity. Anyone with a legitimate research or management purpose should rely on the relevant authorities’ current authorization requirements rather than on travel posts or informal advice.
Why are so many Snake Island stories misleading?
Snake Island attracts dramatic stories because its isolation, venomous endemic snake and restricted access make an unusually compelling combination. But dramatic retellings often turn a real conservation subject into fiction: exact population figures are presented as current counts, the venom is said to melt flesh, and images of huge numbers of snakes are passed off as photographs of the island.
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The misinformation is not merely anecdotal. In a 2026 analysis, Borges, Banci and Marques examined 230 online sources about the golden lancehead and reported that approximately 94% contained false information. That percentage applies to the sample they analyzed—not to every page or post on the internet. The authors identified errors around the snake’s density, venom and images of the species. Butantan has separately called a widely circulated image showing thousands of snakes on the slopes fake and noted that most of the snakes in it are not golden lanceheads.
A quick way to assess a claim is to ask what kind of evidence it offers. Is a population number tied to a dated survey and method, or repeated without context? Does a venom claim come from a named scientific or medical source, or rely on lurid phrasing? Does an image identify the species and location, or merely look dramatic? On a small, protected island with a critically endangered endemic species, a sensational image is not a substitute for evidence.
What is the most accurate way to describe Snake Island?
It is a protected island off São Paulo state, about 35 kilometres from Itanhaém, and the only natural home of the critically endangered golden lancehead. The often-cited figure of roughly 3,000 snakes is an approximate estimate linked to older surveys, not a current census. The snakes are venomous, but claims that they attack people as assassins or that their venom melts flesh are false. Public landing is not allowed as ordinary tourism; access is restricted to authorized research and environmental work.
That description preserves what makes Queimada Grande extraordinary without turning an endangered animal into a monster. The island’s significance lies in its distinctive ecology and the responsibility to protect a species that exists naturally nowhere else.
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Frequently Asked Questions
What is the golden lancehead called in Portuguese?
Its Portuguese common name is jararaca-ilhoa. The species’ scientific name is Bothrops insularis.
Does Butantan make antivenom from golden lancehead venom?
No. Butantan says the golden lancehead’s venom is collected for research, not for making its antibothropic serum; that antivenom uses venom from other Bothrops snakes.
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The 2008 study used forest-plot surveys conducted in 2002, rather than counting every snake across the island. Its authors presented estimates with confidence limits because the method involved uncertainty.
What protections apply to Snake Island?
Queimada Grande is part of the federal ARIE Queimada Pequena and Queimada Grande under ICMBio management. Research visits require authorization; the municipal guide says landing is prohibited.
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