Answer : The blue whale (Balaenoptera musculus), which may grow to a length of 100 feet (30 metres) and weigh up to 200 tonnes, is the longest animal in the world. Much bigger than the largest dinosaurs that have ever lived, blue whales are the biggest animal on Earth.
Marine mammals called blue whales can be found in oceans from the Arctic to the Antarctic. During the feeding season, they can ingest up to 4 tonnes of the tiny shrimp-like animal called krill per day. The loudest sounding mammal is the blue whale, which is distinguished by its unusual blue-gray hue, mottled skin, and enormous size. Its call can be heard more than 600 miles (1,000 kilometres) away.
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