It has been calculated that a single breath from a mature blue whale can inflate up to 2,000 balloons.
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An alligator can go through 2,000 to 3,000 teeth in a lifetime.
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Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
The elephant brain weighs about 6,000g.
274
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12