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But Dr Mousseau suggests a more likely explanation is that evolution has already been at work near Chernobyl, killing off individual birds that cannot cope with the background radiation and allowing the genes of those that have some tolerance to be passed on.
ECONOMIST: Radiation and evolution
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This, he said, would require "some acceptance and tolerance of other land users, especially cattle producers and sheep producers".
BBC: NEWS | Science/Nature | Dingo has 'vital ecosystem role'
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Though that protection wears off as the year goes on, Tipton says people who take an icy dip as long as 14 months later seem to maintain some of their tolerance.
CNN: Are polar bear plunges good for you?