What is the largest mammal in the world?

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The blue whale is the largest mammal in the world and is known for its incredible size, reaching lengths of up to 100 feet (about 30 meters) and weighing as much as 200 tons or more. This marine mammal is not just the largest mammal but also the largest animal known to have ever existed on Earth, outpacing even the largest dinosaurs. Its massive heart can weigh as much as a small car, and its tongue can weigh as much as an elephant.

In comparison, the elephant, while being the largest land mammal, does not come close to the size of the blue whale. The great white shark, despite its size and being an impressive predator of the ocean, is not a mammal; it is a fish. Similarly, the giraffe, the tallest land animal, is significant in height, but again, it does not match the sheer size and mass of the blue whale. Thus, the blue whale's unmatched size solidifies its title as the largest mammal.