Among the ocean's most dangerous creatures, size isn't everything; in fact, some of the smallest marine animals are among the most dangerous. For example, the blue-ringed octopus has an extremely ...

This unassuming octopus pairs bacterial chemistry with evolutionary efficiency to deliver one of the most powerful defenses in all of the ocean. The blue-ringed octopus (genus Hapalochlaena) is small ...

This video shows the Blue-ringed Octopus in the coastal waters of Australia, one of the smallest yet most venomous marine ...