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///@bbcnews: "We are living in a different era". Hermit crabs all over the world, which scavenge shells as armour for their bodies, are turning increasingly to plastic waste instead. It isn't yet clear whether these materials are harmful or helpful for the small, vulnerable crustaceans. Researchers say the findings open up new questions about how these coastal crustaceans interact with and use plastic - and want to find out how it might affect their evolution. Tap the link in @BBCNews's bio to find out how many pieces of plastic are estimated to be floating in our oceans.