A diver has captured a dramatic video of a crab squaring up to an octopus on the seabed in Australia. The video sees the blue-ringed octopus crawling along the seabed before encountering the crab, ...

Crabs can't swim all that fast, so nature has granted them defensive traits that make them the impenetrable forts of the underwater world. Their steel-tough exoskeletons have jagged points that make ...