Could a blue ringed octupus kill shark?

The blue-ringed octopuss could potentially kill a shark, but it would highly depend on the circumstances and the size of both the octopus and the shark. The octopus has a venomous bite, and if it manages to inject its venom into the shark, it could potentially cause paralysis and death.

Here are some factors to consider:

1. Size of the Octopus: The larger the octopus, the more venom it can deliver. A large blue-ringed octopus could potentially inject enough venom to kill even a large shark.

2. Size of the Shark: Smaller sharks are generally more susceptible to the venom of the blue-ringed octopus than larger sharks.

3. Location of the Bite: If the octopus manages to bite the shark in a vulnerable area, such as the gills or the eyes, it could increase the chances of the venom causing significant harm.

While it's possible for a blue-ringed octopus to kill a shark, it's important to note that such occurrences are rare. Sharks predators of octopuses, and in most encounters, sharks pose a greater threat to the blue-ringed octopus than vice versa.