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Watch James Gunn Explain How 'Guardians of the Galaxy' Made Dancing Baby Groot


Guardians of the Galaxy is the biggest movie of the year thanks in part to a monosyllabic, walking tree.

Groot, an animated being ostensibly made of alien wood, provided the heart for the ragtag team of cosmic superheroes, and as writer-director James Gunn told Yahoo Movies this week, it was the voice actor Vin Diesel who provided the heart for Groot.

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