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What is the largest sea animal?

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Blue whales are thought to be the largest animal ever to live on the Earth. read more

The largest sea animal is the blue whale, which is also the heaviest animal on Earth. The blue whale weighs over 200 tons and can grow to 100 feet. Blue whales are magnificent marine mammals that have tongues as heavy as elephants and hearts as large as automobiles. read more

The largest arthropod known to have existed is the eurypterid (sea scorpion) Jaekelopterus, reaching up to 2.5 m (8.2 ft) in body length, followed by the millipede relative Arthropleura at around 2.1 m (6.9 ft) in length. read more

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