20th Century Fox has moved two of its April 2011 releases back a week. Rio has been moved to April 15th, where it faces Scream 4 and Soul Surfer.  The animated film centers on two rare macaws -- the last of their kind -- on an adventure in Brazil.  Rio features the voices of Jesse Eisenberg, Anne Hathaway, George Lopez, Jemaine Clement, Tracy Morgan, Leslie Mann, will.i.am, and Jamie Foxx.

Water for Elephants has been bumped to April 22nd, where it faces African Cats, Born to Be a Star, and Tyler Perry's Madea's Big Happy Family.  The period piece is an adaptation of the acclaimed bestseller about a young veterinary student who falls in love with a circus performer.  Robert Pattinson, Reese Witherspoon, and Christoph Waltz star.  Hit the jump for the official synopses.

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Here’s the official synopsis for Rio:

RIO is a 3-D animation feature from the makers of the “Ice Age” films. Set in the magnificent city of Rio de Janeiro and the lush rainforest of Brazil, the comedy-adventure centers on Blu, a rare macaw who thinks he is the last of his kind. When Blu discovers there’s another – and that she’s a she – he leaves the comforts of his cage in small town Minnesota and heads to Rio. But it’s far from love at first sight between the domesticated and flight-challenged Blu and the fiercely independent, high-flying female, Jewel. Unexpectedly thrown together, they embark on an adventure of a lifetime, where they learn about friendship, love, courage, and being open to life’s many wonders. RIO brings together a menagerie of vivid characters, a heart-warming story, colorful backdrops, energizing Latin and contemporary music, and family-friendly song and dance.

And the synopsis for Water for Elephants:

Based on the acclaimed bestseller, WATER FOR ELEPHANTS presents an unexpected romance in a uniquely compelling setting. Veterinary school student Jacob meets and falls in love with Marlena, a star performer in a circus of a bygone era. They discover beauty amidst the world of the Big Top, and come together through their compassion for a special elephant. Against all odds -- including the wrath of Marlena's charismatic but dangerous husband, August -- Jacob and Marlena find lifelong love.