Elephants


 * Only elephants, humpback whales, and humans undergo menopause.
 * The first bomb dropped in Berlin during World War II hit an elephant.
 * George Washington's teeth were made out of elephant and walrus tusks.
 * Elephants can smell water up to three miles away.
 * Elephants are the only animal with four knees.
 * A female elephant can be pregnant for almost two years.
 * Elephant herds post sentries. When there is danger the sentry raises their trunk in the air and the others are instantly alerted. It is unknown how this communication works.