The incredible moment an octopus outsmarts a crab fisherman and steals his catch

Evidence of the mighty brain power of the octopus has been captured on film after one of the creatures made off with a fisherman's haul.
The footage was shot by a BBC camera crew working on the program Super Smart Animals.
It shows the moment a huge octopus steals a crab caught up in a trap before making a daring escape.
The Giant Pacific Octopus has a huge amount of brain matter, two thirds of which are located in its tentacles.
It uses this intelligence to poach crabs, sneaking into traps laid by fishermen.
Its intelligence allows it to figure out a way in and then out of the trap.
In the BBC's footage, one of the creatures is seen creeping into a trap laid in waters near Vancouver, Canada.
It can be seen smothering and consuming its prey, before beating a hasty retreat, leaving only an empty shell in its wake.
This is just one example of the incredible intelligence of these invertebrates, which scientists are discovering is far more advanced than we first thought.
Octopuses are believed to be highly intelligent, more so than any other kind of invertebrate, but their learning capability is still much debated among biologists.
One scientist, speaking to Max Knoblauch from Pacific Standard, suggests that the creatures’ intelligence could evolve much further with time.
‘Cephalopods clearly manipulate objects, they clearly use tools,’ Dr Russell Burke from Hofstra University in New York told the magazine.
‘They don’t build things, aside from shelters, but it’s certainly imaginable that given the time, given some other factors, those kinds of things could happen.’
Octopuses have been known to break out of aquariums and into others in search of food.
In April 2016, Inky the octopus escaped from the National Aquarium of New Zealand after the lid to its tank was left open.
The invertebrate made the most of the opportunity by crawling out of its enclosure and across the room to a drain, which it used to reach the ocean.
Octopuses have even boarded fishing boats and opened holds to eat crabs stored inside.
They are the only invertebrate which has been shown to use tools, with some species retrieving discarded coconut shells and reassembling them to use as shelter.
In laboratory experiments they can be readily trained to distinguish between different shapes and patterns.
In several widely contested studies, they have even been shown to practise observational learning.
In some countries, octopuses are on the list of experimental animals on which surgery may not be performed without anaesthesia.
British animal testing laws regard them as 'honorary vertebrates', extending them protections not afforded to other invertebrates.