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31,000,000 grains is about half as heavy as a Hippopotamus
In other words, it's 0.5360 times the weight of a Hippopotamus, and the weight of a Hippopotamus is 1.870 times that amount.
(Hippopotamus amphibius) (adult, male)
The average weight of an adult male hippopotamus ranges from 57,900,000 grains. Appearances to the contrary, adult hippos cannot swim or float in water; they actually move by leaping and walking across lake bottoms at about 8 kph (5 mph).
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