It is currently the largest known animal on Earth and belongs to the family of baleen whales. Known for its enormous size and length of 25 to 33 meters, it can weigh up to 150000 to 180000 kilograms. The streamlined body helps them swim quickly in water. The skin appears light blue or mouse gray, with markings on the back and wrinkles and yellow spots on the abdomen. They don't have teeth, but instead have whiskers to filter food, mainly feeding on krill. Blue whales are distributed in the oceans around the world, especially in the Antarctic region where they are most abundant. It is an endangered species that is under international protection and hunting is prohibited. Blue whales have a long reproductive cycle, giving birth every 2 years.