Tiger Snakes – How Deadly Are They?

The tiger snake holds a formidable reputation throughout Australia, often perceived as a fierce and aggressive predator. While their potent venom is indeed a serious concern, few people actually encounter these fascinating reptiles in the wild. It’s truly unfortunate that this species is often criticised solely for its toxicity and perceived aggression, as the tiger snake is, in fact, an incredible survivor, having adapted and thrived in some of the most challenging environments on the continent.

What Does a Tiger Snake Look Like? 

The answer is more varied than you might expect! While the name “tiger snake” often conjures images of distinct black and yellow cross bands, not all species of tiger snakes display these classic markings.

• Banded vs. Unbanded: Some individuals are dark greenish-brown to blackish-brown, with the cross bands varying in thickness and the colours ranging from pale white to bright yellow. However, some tiger snake specimens may entirely lack any banded pattern, particularly those found in the central highlands or the southwest area of Tasmania.
• Size and Build: Tiger snakes typically have wide, somewhat flattened heads and robust, muscular bodies, adapted for both land and aquatic movement.
• Defensive Display: When they perceive a threat nearby, tiger snakes have a distinctive defensive posture: they flatten their bodies to expose the dark skin between their large, glossy scales, making themselves appear larger and more intimidating.
• Mimicry and Confusion: Juvenile tiger snakes can resemble rough-scaled snakes or Stephen’s banded snakes. Depending on the width of their bands, adult tiger snakes might be confused with other venomous species like eastern brown snakes, copperheads, or even black snakes. Notably, some specimens on Kangaroo Island exhibit a reddish belly area, leading to confusion with the red-bellied black snake. Always exercise caution and assume any snake is venomous if you cannot identify it definitively.

Climbing, Burrowing, and Swimming 

Beyond their varied appearance, tiger snakes are incredibly versatile in their movement and habitat utilisation. Unlike many other venomous snakes in Australia, tiger snakes possess remarkable climbing abilities, adeptly scaling both natural formations and man-made structures. Astonishingly, some tiger snakes have been discovered as high as 10 meters above ground!

They are most often found in watery environments that offer ample local cover, making their homes in diverse habitats. These include tangled fallen timber across a creek, deeply matted marsh grasses, or abandoned animal burrows. Tiger snakes thrive across southwestern and southeastern Australia, extending their range to the island habitats of Tasmania and those found in the Bass Strait. Their homes can range from sea level to altitudes of up to 1000 meters, as seen with populations living in Tasmania’s cooler regions.

What Do Tiger Snakes Eat?

The tiger snake is an opportunistic and diverse feeder. The broad diet of a tiger snake living in the wild includes a variety of prey:

• Aquatic Prey: Fish, frogs, and tadpoles are common, reflecting their preference for watery habitats. They can stay submerged for nearly 10 minutes, allowing them to effectively chase aquatic prey.
• Terrestrial Prey: Lizards, small mammals (such as rodents), and even carrion left by other predators also form part of their diet.
• Prey Size: The size of a tiger snake’s prey is generally proportionate to its own body size, allowing them to tackle a range of food sources.
• Hunting Habits: While they mostly hunt during the day, tiger snakes are not averse to foraging on warm evenings, especially when prey is abundant.

Do Tiger Snakes Hibernate?

Like most reptiles found in the wild, tiger snakes are ectothermic, meaning their body temperature is regulated by their external environment. This makes them more active during the warmer months when temperatures allow them to maintain optimal body function.

However, during the winter and other cool periods, tiger snakes do enter a state of dormancy, often referred to as brumation (the reptilian equivalent of hibernation). During this time, their metabolic rate slows down significantly. They seek shelter in secure, secluded locations such as:

• Abandoned animal burrows
• The spaces beneath large boulders
• The hollow trunks of dead trees
• Deep underground burrows (some have been found as deep as 1.2 meters beneath the surface)

Interestingly, in cases of late-season birthing, a female tiger snake might even brumate with as many as two dozen of her offspring, seeking collective warmth and safety.

Are Tiger Snakes Deadly?

Now, to address the most pressing question: Are tiger snakes deadly? The unequivocal answer is yes, tiger snakes are highly venomous, and their bite can be deadly to humans if left untreated.

• Potent Venom: Tiger snake venom is a complex mix of neurotoxins, coagulants, haemolysins, and myotoxins. This powerful combination can cause progressive paralysis, blood clotting disorders, and muscle damage.
• Symptoms of a Bite: Symptoms of a tiger snake bite can include localised pain, numbness, sweating, headache, nausea, vomiting, and eventual paralysis, potentially leading to respiratory failure.
• Aggressive Reputation (with context): Their reputation for being aggressive often stems from their defensive display and willingness to strike when cornered or threatened. A tiger snake will typically flatten its body and raise its head in an S-shape before striking.
• Defensive, Not Offensive: It’s crucial to understand that tiger snakes are generally not aggressive by nature. They are defensive animals that prefer to escape rather than confront. Bites usually occur when a snake feels trapped, is stepped on accidentally, or when people attempt to handle or kill them.
• Medical Emergency: Any suspected tiger snake bite is a medical emergency and requires immediate professional medical attention. Antivenom is highly effective when administered promptly.

While tiger snakes possess a potent defence mechanism, they are integral to Australian ecosystems. Understanding their appearance, habits, and respecting their space is key to coexisting safely with these truly remarkable and resilient reptiles. If you encounter a tiger snake, always maintain a safe distance and never attempt to approach or handle it.