Misc: what animal has bony plates and rolls up into a ball if its frightened?

Questions

In the Sherlock Holmes stories, of what subject was professor Moriarty a professor?

Before Canberra, which city was the capital of Australia?

What word do British people use to describe that which an American would call a 'teeter-totter'?

What is the title of the sequel to the book Gentlemen Prefer Blondes by Anita Loos?

in an average lifetime, the average american eats 84,775 _____?