AOL Moviefone has the exclusive trailer in three high definition formats for Dr. Seuss’ Horton Hears a Who, the upcoming animated feature starring the voices of Jim Carrey and Steve Carell.

The film, from 20th Century Fox Animation, has Carrey as Horton and Carell as the Mayor of Whoville. The cast also includes Carol Burnett, Seth Rogen, Will Arnett, Isla Fisher, Dan Fogler, Amy Poehler, Dane Cook, Jaime Pressly, and Jonah Hill.

Horton Hears a Who hits theaters March 14, 2008. You can watch the first trailer in standard format here after the jump.

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