The incredible moment an octopus puffs up like a parachute - and researchers can't decide if it was hunting or just angry
- An Australian diver filmed the moment an octopus suddenly puffed up
- She thought that the octopus tried to intimidate and scare her way
- But researchers can't agree on what caused it to exhibit this strange behaviour
- Some researchers think the octopus was pushing water on the seafloor to chase prey out of their hideouts, others think it puffed up to try to scare the diver away
An Australian diver filmed the moment an octopus suddenly puffed up, inflating itself with water.
She thought that the octopus was trying to intimidate and scare her away, but researchers can't agree on what caused it to behave this way.
While some researchers think the octopus was pushing water on the seafloor to chase prey out of their hideouts, others think it puffed up to try to scare the diver away.
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![Professor Kathleen Sullivan Sealey, an associate professor of biology at the University of Miami, said the octopus pushed water down on the seafloor to find crustaceans hiding among rocks and coral](http://web.archive.org./web/20170211061750/http://i.dailymail.co.uk/i/pix/2017/02/02/18/3CC4905400000578-4185268-image-a-7_1486058983110.jpg)
Professor Kathleen Sullivan Sealey, an associate professor of biology at the University of Miami, said the octopus pushed water down on the seafloor to find crustaceans hiding among rocks and coral
The diver and film-maker who recorded the video, PT Hirschfield, spotted the octopus off the coast of Melbourne, Australia.
On her blog, she wrote: 'While this magnificent octopus was seriously intent on finding its next morsel, I sensed that it was also becoming a tad annoyed by my continued presence.
'Whether it rushed towards me purely for having sensed some doomed crab’s movement near me which it then puffed itself up like a parachute to capture, or whether its attack posture was also intended to intimidate me remained a mystery.
'I followed as it swam and continued to film the spectacular behaviour I had never encountered before from a slightly increased distance to avoid raising its ire.'
Professor Kathleen Sullivan Sealey, an associate professor of biology at the University of Miami, told Live Science that the octopus was hunting for food.
The octopus pushed water down on the seafloor to find crustaceans hiding among rocks and coral.
'It's shooting water out of its mantle [head],' professor Sullivan Sealey said.
'It was using that water to chase little shrimp out from the rocks so that they would get caught in its legs and the webbing between its legs.'
Ballooning is a fairly common behaviour observed in hunting octopuses.
But researchers at the Birch Aquarium at the Scripps Institution of Oceanography at the University of California, San Diego, think the parachuting behaviour can be explained differently.
They said that in the video, the octopus changed its colour to camouflage itself to its surroundings - but when it saw the diver, it spread out its arms most likely to make itself look bigger, and also changed color.
They said it did this to make itself look big, warning potential predators not to eat it.
Then the octopus swam away and changed back to its camouflage colour.
The Scripps researchers said that the octopus was most likely a Sydney octopus, which is common in those waters.
Ms Hirschfield is an underwater photographer and film-maker who says she has a serious case of OCD - Obsessive Compulsive Diving.
She has terminal endometrial cancer and says she's swimming against it 'one scuba dive at a time.'
![Scripps Institution of Oceanography researchers said the octopus puffed up to make itself look big, warning potential predators not to eat it](http://web.archive.org./web/20170211061750/http://i.dailymail.co.uk/i/pix/2017/02/02/18/3CC4905000000578-4185268-image-a-6_1486058974573.jpg)
Scripps Institution of Oceanography researchers said the octopus puffed up to make itself look big, warning potential predators not to eat it
![PT Hirschfield, the diver who took the video, is an underwater photographer and film-maker who says she has a serious case of OCD - Obsessive Compulsive Diving](http://web.archive.org./web/20170211061750/http://i.dailymail.co.uk/i/pix/2017/02/02/19/3CC4E5F800000578-4185268-image-m-7_1486062940811.jpg)
PT Hirschfield, the diver who took the video, is an underwater photographer and film-maker who says she has a serious case of OCD - Obsessive Compulsive Diving
Near the end of the video, the octopus torpedoes through the water, and Ms Hirschfield said that it 'hurled itself towards me like a bowling bowl and scored its intended non-impact strike.
'I quickly filled my lungs with tanked air to float a meter off the sand as it swam straight through the patch I had been resting on, directly underneath me as I tried to keep its trajectory in focus with my camera.
'I have no idea what might have happened had I not anticipated the move and acted accordingly.
'In recent times at this dive site, bold octopuses have been known to confiscate unwary divers’ cameras.'
![Ms Hirschfield has filmed different types of sea life including sharks, seahorses and crabs](http://web.archive.org./web/20170211061750/http://i.dailymail.co.uk/i/pix/2017/02/02/19/3CC4E93300000578-4185268-image-a-8_1486062973774.jpg)
Ms Hirschfield has filmed different types of sea life including sharks, seahorses and crabs
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