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.