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 consistency, answers should be in all lower cased letters.
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Question: Category: BODY LANGUAGE 
Clue: When vou're idle or just plain bored, you do this with your pollex digits, literally or figuratively

Answer: twiddle your thumbs


Question: Category: THE DREADED SPELLING CATEGORY 
Clue: When you eat in a deli, you should know "deli" is short for this word

Answer: d-e-l-i-c-a-t-e-s-s-e-n


Question: Category: BIRD BOOKS 
Clue: Maya Angelou dedicated this book to "all the strong black birds of promise who defy the odds...and sing their songs"

Answer:
i know why the caged bird sings