DreamWorks Animation SKG Inc. said Tuesday night that it is pushing back the release date for its animated movie “Mr. Peabody & Sherman” by four months, meaning the studio now will release only two films in 2013, the Los Angeles Times reports. An unspecified reduction in staff is expected in the wake of that move, and an expected write-down on the Glendale studio’s disappointing November release, “Rise of the Guardians,” the Hollywood Reporter reports.