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 "Rio" has attracted moviegoers with its tropical-bird theme over Easter weekend. The 20th Century Fox movie keeps perching on the top of North American box office with an estimated $26.8 million, collecting total gross about $81.3 million in two weeks.

Trailing behind "Rio" on the second place is newly-released "Madea's Big Happy Family". The comedy film, which revolves around a wise-cracking grandmother named Madea, opens with approximately $25.8 million from 2,288 theaters.

In the meantime, "Water for Elephants" has a modest opening on number three. Attracting an audience that was 70% female, the PG-13 movie grosses approximately $17.5 million in its ticket sales.

The entrance of Robert Pattinson's drama forces Russell Brand's "Hop" to slide down to the fourth with an estimated $12.5 million. Meanwhile, "Scream 4" drops from last week's runner-up position to number five, earning approximately $7.2 million.

Top Ten Movies at Box Office for April 22-24: