The blue whale is a marine mammal and a baleen whale. Reaching a maximum confirmed length of 29.9 metres and weighing up to 199 tonnes, it is the largest animal known to have ever existed. The blue whale's long and slender body can be of various shades of greyish-blue dorsally and somewhat lighter underneath. Blue whales are still an endangered species and there are thought to be no more than 25,000 living in the world today. Female blue whales weigh more (190,000kg) than males (150,000kg). At around 2,700kg newborn blue whale weighs about the same as an adult hippopotamus. Some larger estimates do exist (placing megalodon up to 67 feet in length and well beyond 50 tons), but the fact of the matter is megalodon was smaller than a blue whale. In terms of size, a blue whale gets the advantage. Blue whales are larger and heavier than a megalodon. The blue mammal is also incredibly heavy: 170+ tonnes, in fact. This is over 4 times larger than a sperm whale, and over 2,400+ the size of a human. Some blue whales are estimated to be as large as 190 tonnes. The whale's heart is about 5 feet in length, 4 feet in width and 5 feet in height, and can weigh as much as 175 kilograms, which is the same as some cars. A blue whale's heartbeat is so loud that it can be heard from almost 2 miles away. But that's not the only interesting thing about a blue whale's heartbeat. It's thought that a blue whale's tongue weighs about 8,000 pounds (3,600 kilograms). It would weigh more than a female Asian elephant. But it would not weigh more than a male elephant, Asian or African (12,000-14,000 pounds/5,400-6,350 kilograms). So it weighs more than some elephants, but not all of them. And with an estimated lifespan of 70 – 90 years, they are also one of the oldest living marine mammals known to inhibit the sea. In fact, the oldest recorded blue whale was estimated to have a lifespan of 110 years!

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