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BBC Inside Science

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The Top Five Wild Mammals in the World

Scientists have measured the collective weight of Earth's wild mammals. In at number five, weighing in at a collective 500,000 tons, it's mule deer. With just half a million individuals, eastern grey kangaroos are fourth heaviest species. But out weighing all those, with a total mass of 2.7 million tons, it is... Wildtail Deer!

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