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In the Pacific, the quest to multiply has spawned a stunning array of unusual behaviours and adaptations. There are forest penguins with a tenuous marriage, the secret rendezvous of great white sharks in the waters around Mexico’s Guadalupe Island , and the tale of male pregnancy. In a tropical cove of China’s Hainan Island, a team of biologists are intervening to rebuild a once-thriving reef.  Humans also intervene in Samoa, where the spawning of Palolo worms produces a rare delicacy

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