The word 'unnatural' is often used to describe what's considered weird or unusual. But is anything weirder than nature?
Just look at 17-year cicadas, poised to flood the U.S. East Coast after having stayed underground since Bill Clinton was President. And cicadas are just the start: Biology abounds with creatures that change shape, change sex, change locations and in some cases cause other creatures to do these things.
It's a strange, marvelous world out there. On the following pages are gathered some of life's oddest, most extraordinary journeys.
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