and even replace eggs in baked goods. food from the marine well that brings us to this week's trivia question. why are whales so big. blue whales feed exclusively on tiny shrimp like creatures known as krill. sounds like they're just snacking all day doesn't it. but still they grow to a monster size. the marine mammals can reach up to thirty three meters in length and can weigh up to two hundred tons. that makes them the biggest animals ever to have