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Laena (Hapalochlaena sp) - Blue-ringed Octopus. I want an octopus fish tank

The Tiny but VERY poisonous Blue Ring Octopus

A blue-ringed octopus. Very beautiful and also one of the world’s most venomous animals.

Blue-ringed octopus (Hapalochlaena), Australia. Beautiful but poisonous.

The diminutive blue-ringed octopus (Hapalochlaena lunulata) looks like a sweet, possibly even fantastical creature. Often measuring less than 20 centimeters long and covered with dozens of bright blue rings, it spends most of its time hiding out in shells or rocks near the beach. But don’t be fooled—this little cephalopod is trouble. One small nip from its beak can inject enough powerful neurotoxin to kill an adult human in minutes.