Skeletons: Skeleton imagery pervades this holiday. In pre-Columbian times, the Day of the Dead was celebrated in August. It now takes place on Nov. 1 and Nov. 2, coinciding with the Catholic holidays of All Saints' Day and All Souls' Day. Karen Castillo Farfán/NPR hide caption

toggle caption Karen Castillo Farfán/NPR

Vampire bats are common in Central and South America, where they feed on livestock and sometimes people. Michael & Patricia Fogden/Corbis hide caption

toggle caption Michael & Patricia Fogden/Corbis

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