Around Europe’s coasts, mi­grat­ing spi­der crabs take an oc­ca­sional break from their usu­ally soli­tary ex­is­tence to find safety in num­bers

World of Animals - - The Amazing World Of Animals -

The Euro­pean spi­der crab is a mi­gra­tory species, ca­pa­ble of cov­er­ing over 160 kilo­me­tres (100 miles) in eight months. Like all crabs, they have to shed their hard ex­oskele­ton (moult) in or­der to grow. Be­fore their new shell has de­vel­oped the crabs are ex­tremely vul­ner­a­ble, and it’s thought that in­ter­moult crabs form these huge groups for pro­tec­tion.

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