If you have seen an elephant, you know that elephants are very big. Elephants are the largest animals that live on land. Do you know what animal is bigger than an elephant? Yes, whales are the biggest animals living on Earth. Shamu, the famous killer whale, is a big animal. Killer whales are 15 to 20 feet long. They make the people around them look small, but killer whales are small. Yes, they are among the smaller whales. Humpback whales are bigger than killer whales. They grow to 35 to 50 feet. If six tall men swam in a close line, they might be as long as a humpback whale. The biggest whale is the blue whale. Blue whales are about 100 feet long. They are the biggest animals on Earth. One blue whale is about as big as ten elephants. People study whales. These people count whales, measure whales, and learn what whales eat and where whales live. Maybe some day you will study whales, too.