Bugs Bunny had been in "Hare-um Scare-um" and as cool and collected as in "Prest-O Change-O". Immediately following on "A Wild Hare", Bob Clampett's "Patient Porky" (1940) features a cameo appearance by Bugs, announcing to the audience that 750 rabbits have been born. The gag uses Bugs' "Wild Hare" visual design, but his goofier pre-"Wild Hare" voice characterization. The second full-fledged role for the mature Bugs, Chuck Jones' "Elmer's Pet Rabbit" (1941), is the first to use Bugs' name on-screen: it appears in a title card, "featuring Bugs Bunny," at the start of the film (which was edited in following the success
Development of Bugs Bunny mouth, and his ears were changed slightly as well. It is worth noting, however, that "Patient Porky" (September 14, 1940) featured a cameo by this prototype Bugs Bunny. The cartoon was so successful that WB decided to keep him on as a recurring character, eventually becoming the studio's most popular cartoon character. The character's name, previously only used on model sheets, became the official all-purpose name as well, with one modification: the apostrophe was dropped from his first name (now pronounced "bugs" rather than "bugs-es"). A title card saying "featuring Bugs Bunny" was slapped onto "Elmer's Pet Rabbit" after initial