Animal Fact Guide is giving away THREE Halloween costumes courtesy of HalloweenCostumes.com.  For a chance to win, simply comment below with your favorite animal fact by September 23. Be sure to include your email address so we may contact the winners for their mailing address and choice of costume.

Three lucky winners will have their choice of any costume available on HalloweenCostumes.com valued up to $50.

Note: This contest is open to people in the U.S. only.

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UPDATE: Congratulations to our winners, Amanda A., Rita M., and Nicole F.!