Blue Whale is 98 feet long (30 meter) in length, and can weigh up to 39,683 pounds (18,000 Kilogram).
Whales are mammals just like us, and they have hair! well, not so much of it, but still.
Back to the Blue Whale. his heart is in the size of a midsize car, and it weighs around 992 pounds (450 kg), let this sink in for a second.
Whales can't sleep for many hours, this is because they have to go back to the surface again for air. as you may already know, they breathe through their blowhole.