Watch: Newborn lion cubs nuzzle their mother

The National Zoo’s "Great Cats" exhibit celebrated the arrival of its first litter of African lion cubs in four years. On Jan. 24, the zoo’s 10-year-old lioness Nababiep gave birth to three cubs—two survived—in an eight-hour period. The cubs are the third litter for Nababiep and the fourth for Luke, the 8-year-old father.