There isn’t a single snake that can be crowned the 'deadliest' in the USA, as danger depends on how you measure it – venom potency, frequency of bites, or actual fatalities.
Snakebites remain one of the leading causes of animal-related fatalities worldwide, with the World Health Organization (WHO) classifying them as a ‘neglected public health issue.’ Take a closer look at some of the world’s deadliest snakes – species whose bites can be swift and fatal.
What’s the deadliest snake in the USA?
The Western diamondback rattlesnake is historically linked to the highest number of deaths, largely because of its wide range and frequent encounters with humans. The Eastern coral snake, though reclusive and responsible for few bites, carries extremely potent neurotoxic venom that can cause respiratory failure if untreated.
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A 2021 study found that between 1989 and 2018, rattlesnakes were responsible for 90.2% of recorded fatal native snakebites in the US. However, deaths from all venomous snakes remain rare, averaging just 2–6 deaths per year, with prompt medical treatment greatly improving survival rates.
What do rattlesnakes look like?
Rattlesnakes are easily recognised by their triangular heads, thick bodies, and distinctive camouflage patterns in earthy tones such as brown, olive, yellow, or grey. While many have the iconic tail rattle, some young snakes, and even certain adults, may lack one, with sizes ranging from the tiny pygmy rattlesnake at under 18 inches to the formidable eastern diamondback, which can grow up to 8 feet long.
Where do rattlesnakes live?
Rattlesnakes are native to the Americas, with 36 recognised species ranging from southern Canada all the way down to Argentina. They are most abundant in the southwestern United States and Mexico, where warm, arid habitats suit them best. Arizona is a true rattlesnake hotspot, home to an impressive 15 different species – the highest diversity of any state.
What species of snake delivers the most bites in the US?
Copperheads bite more people in the US than any other venomous snake, especially in the eastern and southern states, but their venom is relatively mild and rarely fatal.
The Eastern diamondback rattlesnake is the largest venomous snake in North America, delivering a massive dose of hemotoxic venom and has one of the highest untreated mortality rates, though thanks to modern antivenom and medical care, deaths are now uncommon
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