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But if one thing unites all migratory species, it is the fight to survive. ... means looking for food, finding mates or laying eggs, survival is the fundamental motivation.

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A seabird called the sooty shearwater flies an average of 64,000 kilometres yearly over the Pacific ocean. In ... so, it executes a figure-of-eight betweem New Zealand, where it breeds, and stopovers in Japan, Alaska and California.