Irukandji Jellyfish
The tiniest but the deadliest of them all is the Irukandji Jellyfish, which is pegged at the second spot among the most dangerous jellyfish types. It is a part of the lethal box jellyfish family, and is regarded as the most venomous animal on Earth. Experts say that its toxin is hundred folds lethal than that of a king cobra snake. The tentacles and bell of the Irukandji can both sting.
