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Listed as an endangered species, Blue Whale is the largest known animal in the world. It is as long as 80 - 100 feet. Its tongue is so big that 40 - 50 men can stand on it. The tongue is heavier than an elephant. Its heart is the size of a car. Blue whales are also the longest living animal and can live up to 100 years. A female blue whale gives birth once in two to three years. Also, these whales moan and cry so loud that the other whales can hear them a thousand miles away.
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