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Diving with the underwater 'army of arms, legs and claws'

Hundreds of thousands of giant spider crabs amass in waters near Melbourne, Australia, in a unique underwater spectacle. Aquatic scientist Sheree Marris has been diving among them to find out the reasons for this annual migration amongst a 'moving army of arms, legs and claws'.

(Photo: Horde of giant spider crabs, Credit: Sheree Marris)

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Duration:

50 seconds