text: The coyote's name of Wile E. is a pun of the word "wily". The "E" stands for "Ethelbert" in one issue of a Looney Tunes comic book. The coyote's surname is routinely pronounced with a long "e" ( ), but in one cartoon short, To Hare Is Human, Wile E. is heard pronouncing it with a diphthong ( ). Early model sheets for the character prior to his initial appearance (in Fast and Furry-ous) identified him as "Don Coyote", a pun on Don Quixote.
  The Road Runner's "beep, beep" sound was inspired by background artist Paul Julian's imitation of a car horn. Julian voiced the various recordings of the phrase used throughout the Road Runner cartoons, although on-screen he was uncredited for his work. According to animation historian Michael Barrier, Julian's preferred spelling of the sound effect was either "hmeep hmeep" or "mweep, mweep."
  List of cartoons
  The series consists of:
  49 shorts, mostly about six to nine minutes long, but including four web cartoons which are "three-minute, three-dimensional cartoons in widescreen (scope)".
  One half-hour special released theatrically (26 minutes).
  One feature-length film that combines live action and animation.
  1 Re-edited from Adventures of the Road Runner by Chuck Jones and with new music direction from Bill Lava
  2 Re-edited from Adventures of the Road Runner by DePatie–Freleng Enterprises