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Fish could be more intelligent than we've given them credit for in light of new footage that shows grouper coral working with an octopus to catch their prey.
Their remarkable interactions were captured during a shoot for BBC One's Blue Planet II and will be shown on TV for the first time tomorrow night.
Use - Sign - Language - Level - Intelligence
Astounding use of rudimentary sign language demonstrates a level of intelligence that could rival chimpanzees - our closest relative in the animal kingdom.
Grouper fish and octopus hunt the same small fish for food, which are often able to outsmart the larger creatures by hiding in the coral's small crevices.
Footage - Great - Barrier - Reef - Sir
But in awe-inspiring footage filmed on the Great Barrier Reef for Sir David Attenborough's new programme it appears the two rival predators have decided two heads are better than one and opted to work together instead.
Their solution sees the grouper fish chase the smaller ones into a crevice and then turn a paler colour to attract the octopus' attention.
Heads - Tails - Meal - Hiding - Holes
They then stand on their heads and wiggle their tails to indicate there's a tasty meal hiding in one of the holes.
It then comes down to the octopus to place its tentacles in one of the crevices to grab their prey.
Viewers - Partnership - Tomorrow - Night - 'Reef
Viewers will be able to witness the impressive partnership for themselves on tomorrow night's 'Reef' episode of Blue Planet.
Sir David, who narrates the series, told The Telegraph: 'The fish takes fright and swims straight into the grouper's jaws.
Reward - Grouper
'Sometimes the octopus gets the reward, sometimes the grouper does.
'These very different species have discovered that teamwork brings success.'
Dr - Alex - Vail - Cambridge - University
Dr Alex Vail, a Cambridge University scientist turned camerman, who was behind the amazing footage told the newspaper: 'When I first saw it, I was blown away.
'What's fascinating is there seems to be intention behind it.
Grouper - Plan
'The grouper has formulated a plan and is...
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