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Ticks

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Peter Dickson/Flickr Creative Commons
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There may be no bug creepier than a tick.

These sesame-seed-sized parasites crawl slowly and silently up our bodies, surround their mouth-parts in our skin, and then casually slurp their fill of our blood until their bodies expand like tiny water balloons.

So as you carefully pluck a tick from your skin, you may undoubtedly wonder: what purpose could they possibly serve? What good are ticks, exactly?

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