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Rudolph Bucko (real name Rudolph Bouckou) was a working cowhand from Yakima, Washington, who, with his brother Roy Bucko, drifted south and found themselves riding Hollywood's western ranges. Neither brother was often billed but Rudolph was billed by his nickname, "Buck' Bucko, and he actually had a credit or so when he was billed as Rudolph "Buck" Bucko. imdb.com