Mimic Octopus: Mimic octopuses have been observed mimicking numerous different species of animals, some animals being mimicked more often than others. Among the animals mimicked are lionfish, sea snakes, jellyfish, and zebra sole. The octopus' mimicry of flatfish may be its preferred guise. Not only does the mimic octopus use its ability to defend itself from predators, but it also uses aggressive mimicry, to approach wary prey, for example mimicking a crab as an apparent mate, only to devour its deceived suitor
Blue-Ringed Octopus: They are one of the world's most venomous marine animals. Despite their small size, 5 to 8 in. and relatively docile nature, they are very dangerous if provoked when handled because their venom contains a powerful neurotoxin called tetrodotoxin. The blue-ringed octopus carries enough venom to kill 26 adult humans within minutes. Their bites are tiny and often painless, with many victims not realizing they have been envenomated until respiratory depression and paralysis begins. No blue-ringed octopus antivenom is available.