A: That depends if you mean dangerous to humans or dangerous to life in the sea. The killer whale is the top predator in the ocean. It has the ability to hunt and eat anything living in the sea. The stonefish, blue-ringed octopus and sea wasp (a type of jellyfish) however, have a deadly venom, that is capable of killing humans. Great white, bull and tiger sharks can be dangerous to both people and other sea life.
PHYLUM MOLLUSCA
blue-ringed octopus (Octopus maculosus)
size: to 10 cm (3.9 in.) in diameter
distribution: Indo-Pacific; most common along the southern Australia coast
adaptation: extremely venomous saliva
symptom: swelling, numbness, nausea, respiratory failure; may cause death
prevention: don't handle or step on this animal
SeaWorld/Busch Gardens Animal Information Database
www.seaworld.org / www.buschgardens.org
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