What's the biggest sea animal?
Blue WhaleProof: http://science.howstuffworks.com/zoology/all-about-animals/question687.htmNot only is the Blue Whale the largest sea animal, but its the largest animal to ever exist on Earth too.
Oprah Winfrey, when she goes swimming.
actually proof of, blue whales. Although Megalodon (a huge shark) or a giant octopus or squid, have been estimated to be bigger, but no proof has been found.