Filling the need for a family film in theaters, audiences responded to the opening of The Lorax in a big way, with the animated film opening to a huge $70 million, Box Office Mojo is reporting. In addition to having the third best debut of all time in the month of March, the movie also saw the strongest numbers for any movie based off a Dr. Seuss book, beating the opening weekend of The Grinch by more than $15 million.