pregnant female blue-ringed octopus swimming over sandy bottom, arms folded tightly to protect eggs, close-up shot

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