You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: PREHISTORIC TIMES 
Clue: The Stone Age lasted until this metal replaced stone as the primary tool-making material
bronze

Category: HOLLYWOOD HISTORY 
Clue: Creator of Andy Panda, he held the longest contract in Hollywood --  58 years with Universal
walter lantz

Category: CATCHING SOME "Z"s 
Clue: In the 1838 Battle of Blood River, Andres Pretorius led troops against this African people's warriors

the zulus