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A marine biologist diving near the Mornington Peninsula in Victoria, Australia, could not resist taking a selfie with a highly venomous blue-ringed octopus – whose bite can be lethal to humans – when she spotted the beautiful nocturnal creature.

Biologist Sheree Marris told Storyful that “despite its fearsome reputation, [it is] actually quite shy and will usually try to escape at any given opportunity. So I respectfully kept my distance while I was filming.”

The video shows the diver dunking into the background as the deadly octopus moves closer to the camera. She said that she was surprised by the sighting, as blue-ringed octopus are generally nocturnal creatures “coming out of their lairs at night to hunt.”

“Seeing this deadly jewel during the day was a treat!” she said.

Based on the Mornington Peninsula, Sheree Marris is a marine biologist who regularly documents the local marine life for her Instagram account. Credit: Sheree Marris via Storyful