Blue-ringed octopus only has visible rings if it's about to attack – THIS IS CREEPY

colour flash
bright blue
blue
warning
danger
toxic creature
warning colours
dive
sydney harbour
venom
blue ringed octopus
australia
steve backshall
deadliest
deadly 60
wild
wildlife
animals
natural history
nature
bbc worldwide
bbc
Uploaded by: Vincze Miklós
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