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688 tonnes is about six-and-a-half times as heavy as a Blue Whale.
In other words, it's 6.580 times the weight of a Blue Whale, and the weight of a Blue Whale is 0.1520 times that amount.
(Balaenoptera musculus)
Blue whales weigh between 105 tonnes. The largest mammal to have ever lived, blue whales feed almost exclusively on krill — tiny invertebrates weighing about 0.000001000 tonnes each.
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