TASK DEFINITION: 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.
PROBLEM: Category: RULERS 
Clue: In 44 B.C. he was made dictator for life, a post abolished after he died the same year

SOLUTION: julius caesar

PROBLEM: Category: FAMOUS TEENAGERS 
Clue: This young man who turned 18 on June 21, 2000 has a dog named Widgeon & a younger brother named Harry

SOLUTION: prince william

PROBLEM: Category: BOOKS 
Clue: The accompanying text to this book was published separately as "Ornithological Biography" in the 1830s

SOLUTION:
birds of america