Zoo animals remain hot at the box office. Singing stars and Adam Sandler are not.

Ben Stiller and his voice co-stars of "Madagascar 3: Europe's Most Wanted" held on to the No. 1 spot again, with $35.5 million
for the animated sequel's second weekend in domestic theaters.

Studio estimates Sunday put Ridley Scott's sci-fi adventure "Prometheus" at No. 2 again with $20.2 million.

"Madagascar 3" and "Prometheus" held off two under-achieving newcomers. The star-studded musical "Rock of Ages," whose cast includes Tom Cruise, Catherine Zeta-Jones and Alec Baldwin, flopped at No. 3 with $15.1 million.

Sandler's "That's My Boy" bombed with $13 million, the worst showing for one of his broad comedies since the mid-1990s. "That's My Boy" came in at No. 5, behind the $13.8 million for "Snow White & the Huntsman," a film that's been out for three weekends already.

"Sure, we would have liked to have done more," said Rory Bruer, head of distribution at Sony, which released "That's My
Boy" and most of Sandler's past movies.