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Mass of a mature Holstein cow (680 kg) is 500 x Mass of an average human brain (1.35 kg)
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Estimated population of Eastern Grey Kangaroo (2011) (16.06 million individuals)
If this was a standard unit ...
Yes, there's now a book based on these numbers. Oxford University Press: July 2018.
Click here to learn more about it.
Click here for Podcast: Andrew Elliott interviewed for New Books Network.