pregnant female blue-ringed octopus walking over sandy bottom, arms trying to protect eggs, close-up shot from behind

cephalopoda octopus hapalochlaena octopodidae tentacle scuba tetrodotoxin reef underwater eggs bottom critter female sea neurotoxin pacific coral wildlife protect animal poisonous fauna swim marine suckers ocean pregnant mother beauty arms bizarre hidden wild ringed blue ring natural nature muck venom water colorful deadly blue tropic blueringed tropical life