Katie Couric:  "This member of the weasel family, whose name begins and ends with the letter E, is known for its white winter fur."

Me:  "Ermine!"

All the Jeopardy contestants:   <crickets chirping>

Me:  "C'mon, it's ermine!"

Wife:  "I didn't know that."

Me:  "But it's in the weasel family!"

Wife:  "Sorry, I married into the weasel family."

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I knew you'd ferret it out.