Why isn't Yoshi in 'The Super Mario Bros. Movie'?

The Super Mario Bros. Movie dominated the box office again this past weekend and some fans of the hit film based on the Nintendo video game series can't help but wonder: Why isn't Yoshi in the film? The lovable dinosaur-like creature often serves as Mario and Luigi's sidekick, but was nowhere to be found in his usual green form in the animated flick.

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Why isn't Yoshi in 'The Super Mario Bros. Movie'?