We've already dealt with record-breaking ears and dogs who break records, too. But what about those huge animals . . . like the Sperm Whale with a brain alone weighing like 20 pounds! Think you know a thing or two about some truly astonishing lengths and weights? Check yourself in this quiz – you never know when you can impress people with your new knowledge!
Quiz: How Big Is Big? (Hint: It's Really, Really Big)
How long is the largest wingspan of any bird?