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Behaviour category third place. Millions of crabs by Rui Guerra (Portugal). Location: Berlengas natural reserve, Portugal. “Every year, millions of crabs form large red masses in places along the coast of Portugal. This high density of swimming crabs is somewhat rare. On this day we first spotted some dispersed crabs, but it took us almost an hour to find a higher concentration. And a further 20 minutes of blue-water diving until I noticed this immense “red cloud” made up of maybe several thousand crabs swimming through the water”. (Photo by Rui Guerra/Underwater Photographer of the Year 2016)
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