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Diversity in personality could be as important as having lots of species.
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"If they can fit it in their mouth, they're going to eat it."
Our instrumental record doesn’t stretch back far, but proxies reveal the non-tropical Northern Hemisphere has not been this hot for millennia.
Some of these birds undertake one of the most remarkable migrations in nature, the others never leave home.
Even mild infections may be sufficient to trigger this serious condition.