Fox's animated feature "Dr. Seuss' Horton Hears a Who!" hit all its marks during the weekend, when the animated family comedy featuring the voice of Jim Carrey opened with an estimated $45.1 million to top the domestic boxoffice and re-energize a recently slack marketplace.

Warner Bros.' prehistoric adventure "10,000 BC" dropped an acceptable 54% in its second weekend to take second place with $16.4 million and a $61.2 million cume. Summit Entertainment's mixed-martial arts film "Never Back Down" bowed about as expected with $8.6 million in third place.

The weekend was bolstered by high school and college students hitting spring break, but the session included at least one belly flop. The R-rated thriller "Doomsday," from Universal's Rogue genre unit, appears doomed for quick excursion to DVD after fetching just $4.7 million in a limp debut in seventh place.

Full story: hollywoodreporter.com