Blue Whales are endangered species. They are as big as 3 school buses put together. They weigh more than 1 ton. these whales are the largest marine mammals in the world. Blue whales can grow up till 50 feet. Their babies ate about 4-5 feet. Blue whales are usually spotted in waters not near the equator. If you have seen a blue whale or have a story to share you can go to the comments section and send a comment.