In a practical sense, the title of most poisonous animal would go to the organism that has the ability to kill the most people. Unfortunately, this is a very ambiguous way of deciding what is the most poisonous animal.
The Black Widow, in a given year, will kill more people than the Poison Dart Frog. Subsequently, the Black Widow could be declared more poisonous, though in reality this is quite debatable, because the lethal toxins produced by the Poison Dart Frog are much stronger than those produced by the Black Widow. However, since the Black Widow is more aggressive than the Poison Dart Frog, coupled with the fact that it is more commonly found in densely populated areas, the Black Widow has the ability to kill more people. Thus, does the title of most poisonous go to the animal that kills more people in a given year with its lethal toxins, or does it go to the creature that has the most lethal toxin?
If one chooses to define the most poisonous animal as the organism that produces the most volatile toxin, then you face a similar problem as with the Black Widow and Poison Dart Frog.
The Marbled Cone Snail is one of the most deadly and poisonous creatures alive today. It comes from the genus Conus, and the family Conidae. The Marbled Cone Snail, and other members of the Conidae family, are predatory sea snails that produce neurotoxins in specialized venom glands. Whereas the Marbled Cone Snail is one of the most poisonous members of the Conidae family, the toxin it produces is identical to other sea snails in its family. In situations where multiple organisms produce the same toxin, how do you declare one organism to be more poisonous than another? You could, if you change your definition of what a poisonous animal is, but that doesn’t mean you have a definitive answer.
It is the ambiguous nature of how one decides what is the most poisonous animal that results in no one organism being selected as supreme under all possible circumstance and definitions. However, for the sake of discussion, I will define the most poisonous animal as the organism that produces the deadliest toxin in proportion to its biomass. According to that definition, the title of most poisonous animal would belong to the creature that can deliver the strongest punch with the smallest body.
Thus ladies and gentlemen, people of all ages, I present to you the world’s most poisonous animal alive. It is the one, the only, the mighty Irukandji Jellyfish!
The Irukandji Jellyfish is by far the most poisonous animal in existence today. It is a relative of the box jellyfish and a native of the coastal waters of Australia. It produces one of the most volatile neurotoxins in all of existence.
The most amazing thing about the Irukandji Jellyfish is its size. It is roughly one cubic centimeter in size and doesn’t get larger that that. To put that into perspective, it is about the size of your thumbnail. Its tentacles, however, are much longer; they can grow up to 1 meter in length.
There you have it. The Irukandji Jellyfish is quite possibly the most poisonous animal in terms of the proportional relationship between biomass and toxin lethality. Now, it may not kill the most people in a given year, or even be the most aggressive and likely to attack, but it is still one hell of a deadly creature. It truly does deserve the title of most poisonous.