The world title for the most venomous snake belongs to the Inland Taipan (Oxyuranus microlepidotus), a species found exclusively in Australia. Its bite can inject enough venom to kill over one hundred people.
In Brazil, the title of the most venomous snake is held by the True Coral Snake (Micrurus sp.), which is a distant relative of the taipan.
Both snakes belong to the family Elapidae, which includes 240 highly toxic species worldwide, excluding Europe, according to biologist Otavio Marques from the Butantan Institute in São Paulo. It is estimated that annually between one and two million snake incidents occur, whether venomous or not, of which about 50,000 end fatally.
Venomous snakes (the technical term for animals that inject toxins, as in the case of snakes) are classified into three different categories based on the action of their venoms.
The first group, which includes the taipan and the coral snake, possesses venom that acts on the peripheral nervous system, causing respiratory arrest. Vipers, on the other hand, inject substances that provoke blood clotting disorders, hemorrhages, and local necrosis. Finally, sea snakes secrete myotoxin, responsible for muscle fiber destruction and acute kidney failure, according to biologist Fatima Viveiros, also from the Butantan Institute.
Situation in Brazil
Among dangerous snakes in Brazil, the following species stand out:
- True Coral Snake (Micrurus sp.): Although it is the most venomous snake, it is rarely bitten, accounting for only 1% of all snake incidents in the country.
- Rattlesnake (Crotalus durissus): Approximately 30% of victims of this snake die if they do not receive antivenom in time.
- Surucucu Pico-de-Jaca (Lachesis muta): This is the largest venomous snake in Latin America, exceeding three meters in length. Its bite causes severe swelling and bleeding.
Global Situation
Globally, the most dangerous are considered to be:
- Inland Taipan (Oxyuranus microlepidotus): An Australian snake whose bite can cause respiratory paralysis and death within minutes, and it is considered the most venomous in the world.
- Brown Snake (Pseudonaja textilis): Another Australian species; a single drop of its potent venom is enough to be fatal to a human.
- Malay Ground Snake (Bungarus candidus): Found in Southeast Asia and so dangerous that 50% of victims do not survive even after receiving antivenom.


