This applies mainly for the sperm whale which can stay underwater for as long as 90 minutes, although a typical dive for other species is around 35 minutes. Whales do not sleep as we do. To rest, whales sleep only half brain so they remember to take air in, otherwise they would drown. The most famous story about whales is Moby Dick.
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Dec 08, · The Sperm Whale is also threatened, and is classed as ‘Vulnerable’. Other whale species may be threatened, but there isn’t enough data to classify them yet. Today’s Blue Whale population is under 1% of its original size. However, due to hunting bans, the number of Blue Whales is growing. There may be as many as 12, Blue Whales alive.