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Birds migrate away from diseases


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In a unique study, researchers have mapped the origins of migratory birds. They used the results to investigate and discover major differences in the immune systems of sedentary and migratory birds. The researchers conclude that migratory species benefit from leaving tropical areas when it is time to raise their young -- as moving away from diseases in the tropics enables them to survive with a less costly immune system.1X4xvWehrIg

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