The boxjellyfish is the most toxic animal on earth. 
Forget the vinegar which basically only soothes the stinging skin. 
You probably won't even make it to the vinegar on the beach, often people have a heart attack from the toxin while still in the water. 
## Northern Australia. Beautiful and deadly. 
_PS you probably won't find the vinegar lying around in Australia either, urine apparently does the job I'm told._


### _Edit_
**I felt obligated to research this particular killer. I didn't want to be misleading when it comes to such a deadly creature.**
Vinegar is indeed recommended. If travelling in northern Australia you should carry it. 
Distribution - Shallow, tropical Australian waters north of Agnes Water, Queensland, 
all Northern Territory waters and Western Australia south to Exmouth. 
Size and appearance - A large but almost transparent jellyfish with a box-shaped bell up to 38cm in diameter. Up to 17 ribbon-like tentacles arise from each of the four corners. These may contract to about 10cm or may extend up to 3m.
Symptoms and signs - Its sting causes immediate severe burning pain and whip-like marks, often with tentacles remaining on the stung area. Severe stings may cause the casualty to stop breathing and suffer cardiac arrest. 
### First aid
1. Remove casualty from water if safe to do so
2. DRSABCD
3. If casualty has more than one localised single sting or looks/feels 
unwell, dial 000 (aust emergency) and seek assistance from a lifesaver (many beaches not patrolled) 
4. Assess casualty and commence CPR immediately if required
5. If possible, treat the sting by pouring **vinegar** for at least 30 seconds and then pick off the tentacles
6. If vinegar is not available, pick off tentacles (this is not harmful to the rescuer) and rinse well with sea water. Apply a cold pack or ice in a bag for analgesia
• Anti venom is available for Chironex fleckeri and other multi-tentacled box jellyfish stings at hospitals and ambulance stations in tropical 
coastal areas • **Casualties who initially appear stable but experience severe 
symptoms in the following 30 minutes may be suffering Irukandji syndrome and need urgent medical care**
• Chironex fleckeri is widely regarded as the world’s most venomous animal • There have been recorded fatalities due to box jellyfish stings in Australian waters. A box jellyfish can kill an adult human in 2-3 minutes with only 2-5m of tentacles • Chironex fleckeri become deadly when the bell reaches 8-10cm in 
size, however all sizes can still inflict significant painful stings

# Perhaps the urine notion could be explored on a future _fact or fiction_

www.stjohnnsw.com.au/bites-and-stings-quick-guide/
www.gondwananet.com/australian-animals-jellyfish.html