re: Fatal shark attack in Australia

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Scary arse place to be in the water.

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Recently learned Australia has a lot of saltwater crocodiles as well. Scary arse place to be in the water.

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Blue-ringed octopuses

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Tetrodotoxin causes severe and often total body paralysis. Tetrodotoxin envenomation can result in victims being fully aware of their surroundings but unable to move. Because of the paralysis, they have no way of signaling for help or indicating distress. The victim remains conscious and alert in a manner similar to curare or pancuronium bromide.

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Chironex fleckeri, commonly known as the Australian box jelly

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In common with other box jellyfish, C. fleckeri has four eye-clusters with 24 eyes. Some of these eyes seem capable of forming images, but whether they exhibit any object recognition or object tracking is debated

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In Australia, C. fleckeri has caused at least 64 deaths since the first report in 1883,[9] but most encounters appear to result only in mild envenomation.[10] Among 225 analyzed C. fleckeri stings in Australia's Top End from 1991 to 2004, only 8% required hospital admission, 5% received antivenom and there was a single fatality (a 3-year-old child).[4] 26% experienced severe pain, while it was moderate to none in the remaining.[4] Most deaths in recent decades have been children, as their smaller body mass puts them at a higher risk of fatal envenomation.[9] When people do die, it is usually caused by a cardiac arrest occurring within minutes of the sting.[4] It takes approximately 3 m (10 ft) of tentacle to deliver the fatal dose

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