Man is a [fill in the blank] animal

QUOTE:

“Man is by nature a political animal.”
       Aristotle (384 BC-322 BC)
       Greek philosopher
       Politics, Bk. I

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COUNTERQUOTE:

“We are, perhaps, uniquely among the earth's creatures, the worrying animal.  We worry away our lives.”
       Dr. Lewis Thomas (1913-1993)
       American physician and author
       The Medusa and the Snail (1979) 

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