Watch out on April 1 . . . It’s April Fools’ Day! For hundreds of years, people have been playing pranks on this day. No one knows when the holiday started. Some historians think it’s based on an ancient Roman festival called Hilaria (Ee-LAH-ryah). People would dress in disguises and imitate their friends.

However it began, April Fools’ Day has inspired some wacky pranks. Like the time in 1959 when a group of students in São Paulo, Brazil, tried to get a rhinoceros elected to the city council—and the rhino won!