Box jellyfish are cnidarian invertebrates distinguished by their cube-shaped medusae. Some species of box jellyfish produce extremely potent venom: Chironex fleckeri, Carukia barnesi and Malo kingi.
The reef stonefish is the most venomous fish in the world. - Irina2932
Great White Shark
The great white shark, also known as the great white, white pointer, white shark, or white death, is a species of large lamniform shark which can be found in the coastal surface waters of all the major oceans.
This is the most dangerous shark and my cousin said to be the hammer
Blue Ringed Octopus
It is more dangerous than a squid, do not think so!
That's different in a anaconda and stuff?
The killer whale or orca is a toothed whale belonging to the oceanic dolphin family, of which it is the largest member.
They literally eat Great White Sharks.
Stan Lee: 'enough said.
The tiger shark is a species of requiem shark and the only extant member of the genus Galeocerdo. It is a large macropredator, capable of attaining a length over 5 m. Populations are found in many tropical and temperate waters, especially around central Pacific islands.
These things eat everything. They should be number 1.
The bull shark is a requiem shark that is considerably dangerous. These sharks live in both freshwater and saltwater environments. Bull sharks can be recognized by seeing a shark in freshwater and watching the shark due a hit and run.
Swordfish, also known as broadbills in some countries, are large, highly migratory, predatory fish characterized by a long, flat bill.
Squid are cephalopods of the order Teuthida, which comprises around 304 species. Like all other cephalopods, squid have a distinct head, bilateral symmetry, a mantle, and arms.
The giant squid is a deep-ocean dwelling squid in the family Architeuthidae. Giant squid can grow to a tremendous size due to deep-sea gigantism: recent estimates put the maximum size at 13 m for females and 10 m for males from the posterior fins to the tip of the two long tentacles (second only to ...read more.