Jayhawkers is a term that came into use just before the American Civil War in Bleeding Kansas. It was adopted by militant bands of Free-Staters. These bands, known as "Jayhawkers", were guerrilla fighters who often clashed with pro-slavery groups from Missouri known at the time as "Border Ruffians".
After the Civil War, the word "Jayhawker" became synonymous with the people of Kansas.[1] Today a Jayhawk is typically a student, fan, or alumnus of the University of Kansas. "Jayhawk" is also the name of their mascot, a mythical bird with a history based on the Bleeding Kansas era term.[2]