References and Further Information: 1  Morrissey, J.F. and J.L. Sumich. 2012. Introduction to the Biology of Marine Life (10th Edition). 2  University of California Museum of Paleontology. Bilateral (left/right) Symmetry.
A lot of things. For one, Whale sharks are fish and use gills to breathe. Blue whales are mammals. The blue whale is also bigger than the whale shark. The tail structure is also different if you watch the whale shark swim, it uses its tail in a side to side motion while the blue whale uses a up and down movement.
North Atlantic Right whales (Eubalaena glacialis) are big, but they're not the biggest whales. That distinction goes to the Blue whale (Balaenoptera musculus), the largest animal on Earth.While the Orca, or Killer whale size of up to 31 feet make it the largest dolphin.The Sperm whale on the other hand may not be the biggest whale, but it has the biggest brain to have ever existed on Earth. Below is a comparison chart of whale sizes. To learn more whale facts follow the links below.orth Atlantic Right whales (Eubalaena glacialis) are big, but they're not the biggest whales. That distinction goes to the Blue whale (Balaenoptera musculus), the largest animal on Earth.