Highly venomous sea snakes, part of the cobra family, found in Australian and Asian waters. Though potent, their small size and non-aggressive nature make human fatalities rare.
Pufferfish: Highly poisonous with tetrodotoxin. Second most toxic creature globally. Avoid their eyes, liver, kidneys, ovaries, and spikes.
Blue-ringed octopus: Deadly toxin, small but lethal. Bite goes unnoticed, causing respiratory failure, paralysis, and death. No known antidote.
Reef Stonefish: Highly venomous, camouflaged spines, excruciating sting, organ damage, respiratory paralysis. Avoid contact at all costs.
Great white shark: Massive size, long lifespan, powerful swimmer, coastal and offshore habitats, distinctive coloration, serrated teeth.
Box jellyfish: Venomous stings, dangerous sea wasp, lethal poison, rapid fatalities, excruciating sting, no effect from peeing on the sting.
Venomous lionfish with dangerous spines found in Indo-Pacific and Atlantic waters. Painful sting, nocturnal hunters, diverse habitats, wide geographic range.
Tiger shark: Large, wide-ranging predator with varied diet. Threatened species, potential prey for orcas. Second to great white in human attacks.
Stingrays are usually docile, but their barbed tails can be dangerous. Steve Irwin's death highlighted their potential threat.
The Great Barracuda is a large, fast fish with sharp teeth. It can be dangerous, with cases of aggressive behavior towards humans.