The largest animal in the world is the blue whale, which is also the largest animal currently known. The blue whale is a huge cetacean that can be more than 30 meters long and weigh about 173 tons. They have very large hearts and arteries that can carry enough oxygen to all parts of the body to support their huge size and ability to move.
Blue whales usually travel alone or in pairs and are mainly found in temperate and polar waters of the world's oceans. They are carnivorous mammals that feed on plankton and need to consume about 4 tons of food every day to maintain life. Although blue whales are the largest animals in the world, they generally belong to the ecosystems of temperate, temperate and polar seas and do not pose a hazard to humans.
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