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Mouse-Taken Identity is a 1957 Merrie Melodies cartoon.
Sylvester Cat checks in to work at a museum with his son, Junior. He is bragging about his mouse-catching prowess when the baby kangaroo, Hippety Hopper, having escaped from the zoo, turns up in the museum. Sylvester and Junior, as usual, mistake Hippety for a giant mouse and chase him around the exhibits.