What type of details about robert mckimson can be gathered from the following bio? Bio: robert porter '' bob '' mckimson , sr. -lrb- october 13 , 1910 -- september 29 , 1977 -rrb- was an american animator , illustrator , and director best known for his work on the '' looney tunes '' and '' merrie melodies '' series of cartoons from warner bros. , and later depatie-freleng enterprises . he was also well known for defining bugs bunny 's look in 1943 .
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