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Why migrate? It's not for the fruit

Why do some birds fly thousands of miles between breeding and nonbreeding areas every year while others never travel at all? The textbook explanation is that the difference is whether the birds eat fruit. Not so -- the pressure to migrate comes from seasonal food scarcity, not what the birds ate. The team also found that birds that forage with others of the same species are less likely to migrate.

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Keywords: migrate, fruit

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